Mewtwo: Master League IV Guide

How far your IVs can slip before this Master League attacker gives up specific matchups, using its standard Master League moveset. Breakpoints, bulkpoints, CMP, and named matchups across the full best-buddy grid, over all 9 ordered shields, your-opp (0-0 .. 2-2).

Format credit: the structure, terminology, and presentation of this guide are adapted from XehrFelrose's Master League IV deep dives. In particular the "Terms to know" vocabulary (including the "Premium" vs "Thrifty" IV framing), and the per-stat by best-buddy by shield breakdown, follow XehrFelrose's work. The numbers here are independently re-simulated with this project's own engine, not taken from the video.

What this covers

Terms to know

Breakpoint
An attack-stat threshold where your fast move deals 1 more damage to a specific opponent. Most impactful on fast moves that fire every turn.
Bulkpoint
A defense-stat threshold where a specific opponent's fast move deals 1 less damage to you.
CMP (charge-move priority)
When both Pokemon throw a charged move on the same turn, the one with the higher attack stat goes first. "CMP lost" means a lower attack IV drops you below an opponent's attack, so you would lose that simultaneous-throw.
Shields (you-opp)
Shield scenarios are written you-opp (your shields first). This guide covers all 9 ordered scenarios (0-0, 0-1, 0-2, 1-0, 1-1, 1-2, 2-0, 2-1, 2-2), so "you 2 / opp 1" (2-1) is distinct from "you 1 / opp 2" (1-2). Even energy, standard movesets.
BB (best buddy)
Best-buddy boost adds one level (L50 to L51). In Master League there is no CP cap, so that level fully applies.
Premium vs Thrifty IVs
Terminology from XehrFelrose (video). Defined here mechanically, not as a gameplay call: a Premium spread drops no matchups versus a perfect (hundo) IV spread in the stated case; a Thrifty spread drops only the matchups listed next to it. Whether those matchups matter is your call.

These terms and the breakdown that follows are adapted from XehrFelrose's Master League IV deep dives.

The build

This guide assumes Mewtwo with its standard Master League moveset. Base stats atk 300 / def 182 / hp 214.

Check my IVs

Paste one or more candidate spreads as atk/def/hp (for example 15/15/14, 15/14/15), and this builds a PvPoke-style matchups table showing only the matchups where those spreads differ. Spreads that agree everywhere are hidden, so the table stays scannable. This guide covers IVs 15 down to 12; the richest close-call detail is on spreads that drop a single stat. Enter two or more spreads and you also get a leftover-HP margin view (how much more convincingly each wins) and a ✦ marker for matchups that flip when you toggle your own best-buddy (L50 ↔ L51) in the selected Case.

Versus the Master League meta

Win/loss at a perfect IV on the 3 even shields (0-0, 1-1, 2-2), in the best buddy, vs a best-buddy meta case (you L51 vs opponents L51), vs the 61-strong Master top-60. The full per-shield picture is in the stat tables below.

Shield-dependent (split on even shields): Zacian (Crowned Sword), Palkia (Origin), Lunala, Xerneas, Reshiram, Kyogre, Zekrom, Palkia (Shadow), Metagross (Shadow), Necrozma (Dawn Wings), Garchomp (Shadow), Garchomp, Ho-Oh, Palkia, Latios (Shadow), Kyogre (Shadow), Gyarados (Shadow), Gholdengo, Solgaleo, Melmetal, Kyurem, Tapu Lele, Sylveon, Gyarados, Groudon (Shadow), Ho-Oh (Shadow), Reshiram (Shadow).

What best buddy changes (at a perfect IV)

Matchups best buddy (L51) gains over not best-buddying (L50), holding the meta's best-buddy status fixed. Even shields, perfect IV.

Vs a non-best-buddy meta

Gains: Dialga (Shadow) 2-2, Gholdengo 0-0, Melmetal 2-2, Mewtwo (Shadow) 0-0, Mewtwo (Shadow) 1-1, Mewtwo (Shadow) 2-2, Mewtwo 0-0, Mewtwo 1-1, Mewtwo 2-2, Palkia (Origin) 2-2, Sylveon 2-2

Vs a best-buddy meta

Gains: Meloetta (Aria) 2-1, Palkia (Origin) 2-2, Reshiram (Shadow) 1-1, Zamazenta (Crowned Shield) 1-1

Attack IVs

Attack at a perfect IV: 266.3 at L51 (best buddy), 264.7 at L50. Each row drops only that one stat (the other two stay 15); matchups shown are those given up versus a perfect IV.

No best buddy, vs a non-best-buddy meta

AtkAttackCMP lostBreakpoint lostMatchups dropped (you-opp)
14263.9Mewtwo-
13263.0Mewtwo-
12262.2Mewtwo-
Close calls (still a win, but the post-match margin shifts enough to matter: a shield spent, a near-death survival, or roughly one fewer charged move of energy banked)
13 Atk:
  • Togekiss 2-2 near-death win: still wins but barely survives, 2 HP left of 192 -- a perfect 15/15/15 keeps 54
12 Atk:
  • Togekiss 2-2 near-death win: still wins but barely survives, 2 HP left of 192 -- a perfect 15/15/15 keeps 54

No best buddy, vs a best-buddy meta

AtkAttackCMP lostBreakpoint lostMatchups dropped (you-opp)
14263.9--
13263.0-Kyogre, Groudon
12262.2-Kyogre, Groudon, Landorus (Therian)
Close calls (still a win, but the post-match margin shifts enough to matter: a shield spent, a near-death survival, or roughly one fewer charged move of energy banked)
13 Atk:
  • Groudon (Shadow) 2-1 energy banked: still wins but banks 45 less energy than a perfect 15/15/15, about one fewer charged move (now 0, was 45)
  • Kyogre 2-2 near-death win: still wins but barely survives, 8 HP left of 192 -- a perfect 15/15/15 keeps 34
  • Kyogre (Shadow) 2-1 energy banked: still wins but banks 45 less energy than a perfect 15/15/15, about one fewer charged move (now 0, was 45)
  • Metagross (Shadow) 1-0 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Metagross (Shadow) 2-0 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Palkia 2-1 energy banked: still wins but banks 45 less energy than a perfect 15/15/15, about one fewer charged move (now 0, was 45)
12 Atk:
  • Groudon (Shadow) 2-1 energy banked: still wins but banks 45 less energy than a perfect 15/15/15, about one fewer charged move (now 0, was 45)
  • Kyogre 2-2 near-death win: still wins but barely survives, 8 HP left of 192 -- a perfect 15/15/15 keeps 34
  • Kyogre (Shadow) 2-1 energy banked: still wins but banks 45 less energy than a perfect 15/15/15, about one fewer charged move (now 0, was 45)
  • Metagross (Shadow) 1-0 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Metagross (Shadow) 2-0 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Palkia 2-1 energy banked: still wins but banks 45 less energy than a perfect 15/15/15, about one fewer charged move (now 0, was 45)

Best buddy, vs a non-best-buddy meta

AtkAttackCMP lostBreakpoint lostMatchups dropped (you-opp)
14265.4--
0-0 Mewtwo
13264.6MewtwoGholdengo, Melmetal
12263.7MewtwoGholdengo, Melmetal
Close calls (still a win, but the post-match margin shifts enough to matter: a shield spent, a near-death survival, or roughly one fewer charged move of energy banked)
14 Atk:
  • Palkia (Shadow) 1-0 near-death win: still wins but barely survives, 25 HP left of 193 -- a perfect 15/15/15 keeps 107
  • Palkia (Shadow) 2-0 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
13 Atk:
  • Gholdengo 1-0 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Gholdengo 2-0 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Palkia (Shadow) 1-0 near-death win: still wins but barely survives, 25 HP left of 193 -- a perfect 15/15/15 keeps 107
  • Palkia (Shadow) 2-0 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
12 Atk:
  • Gholdengo 1-0 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Gholdengo 2-0 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Palkia (Shadow) 1-0 near-death win: still wins but barely survives, 25 HP left of 193 -- a perfect 15/15/15 keeps 107
  • Palkia (Shadow) 2-0 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Togekiss 2-2 near-death win: still wins but barely survives, 3 HP left of 193 -- a perfect 15/15/15 keeps 55

Best buddy, vs a best-buddy meta

AtkAttackCMP lostBreakpoint lostMatchups dropped (you-opp)
14265.4Mewtwo--
13264.6Mewtwo-
12263.7Mewtwo-
Close calls (still a win, but the post-match margin shifts enough to matter: a shield spent, a near-death survival, or roughly one fewer charged move of energy banked)
13 Atk:
  • Reshiram (Shadow) 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
12 Atk:
  • Reshiram (Shadow) 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)

Defense IVs

Defense at a perfect IV: 166.5 at L51 (best buddy), 165.5 at L50. Each row drops only that one stat (the other two stay 15); matchups shown are those given up versus a perfect IV.

No best buddy, vs a non-best-buddy meta

DefDefenseBulkpoint lostMatchups dropped (you-opp)
14164.7Zamazenta (Crowned Shield), Gyarados (Shadow)
13163.9Zamazenta (Crowned Shield), Kyogre (Shadow), Gyarados (Shadow), Jirachi, Dragonite (Shadow)
12163.0Zamazenta (Crowned Shield), Kyogre (Shadow), Gyarados (Shadow), Gholdengo, Jirachi, Dragonite (Shadow)
Close calls (still a win, but the post-match margin shifts enough to matter: a shield spent, a near-death survival, or roughly one fewer charged move of energy banked)
14 Def:
  • Gyarados (Shadow) 2-2 near-death win: still wins but barely survives, 3 HP left of 192 -- a perfect 15/15/15 keeps 34
  • Zamazenta (Crowned Shield) 2-2 near-death win: still wins but barely survives, 15 HP left of 192 -- a perfect 15/15/15 keeps 43
13 Def:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Dragonite (Shadow) 0-0 near-death win: still wins but barely survives, 25 HP left of 192 -- a perfect 15/15/15 keeps 45
  • Dragonite (Shadow) 1-1 near-death win: still wins but barely survives, 14 HP left of 192 -- a perfect 15/15/15 keeps 36
  • Gyarados (Shadow) 2-2 near-death win: still wins but barely survives, 3 HP left of 192 -- a perfect 15/15/15 keeps 34
  • Zamazenta (Crowned Shield) 2-2 near-death win: still wins but barely survives, 15 HP left of 192 -- a perfect 15/15/15 keeps 43
12 Def:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Dragonite (Shadow) 0-0 near-death win: still wins but barely survives, 24 HP left of 192 -- a perfect 15/15/15 keeps 45
  • Dragonite (Shadow) 1-1 near-death win: still wins but barely survives, 13 HP left of 192 -- a perfect 15/15/15 keeps 36
  • Gyarados (Shadow) 2-2 near-death win: still wins but barely survives, 3 HP left of 192 -- a perfect 15/15/15 keeps 34
  • Zamazenta (Crowned Shield) 2-2 near-death win: still wins but barely survives, 15 HP left of 192 -- a perfect 15/15/15 keeps 43

No best buddy, vs a best-buddy meta

DefDefenseBulkpoint lostMatchups dropped (you-opp)
14164.7Kyogre (Shadow), Jirachi, Dragonite (Shadow)
13163.9Kyogre (Shadow), Gholdengo, Jirachi, Dragonite (Shadow)
12163.0Zacian (Crowned Sword), Garchomp (Shadow), Garchomp, Kyogre (Shadow), Gholdengo, Solgaleo, Jirachi, Dragonite (Shadow)
Close calls (still a win, but the post-match margin shifts enough to matter: a shield spent, a near-death survival, or roughly one fewer charged move of energy banked)
14 Def:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Dragonite (Shadow) 0-0 near-death win: still wins but barely survives, 25 HP left of 192 -- a perfect 15/15/15 keeps 45
  • Dragonite (Shadow) 1-1 near-death win: still wins but barely survives, 14 HP left of 192 -- a perfect 15/15/15 keeps 36
13 Def:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Dragonite (Shadow) 0-0 near-death win: still wins but barely survives, 24 HP left of 192 -- a perfect 15/15/15 keeps 45
  • Dragonite (Shadow) 1-1 near-death win: still wins but barely survives, 13 HP left of 192 -- a perfect 15/15/15 keeps 36
12 Def:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Dragonite (Shadow) 0-0 near-death win: still wins but barely survives, 24 HP left of 192 -- a perfect 15/15/15 keeps 45
  • Dragonite (Shadow) 1-1 near-death win: still wins but barely survives, 13 HP left of 192 -- a perfect 15/15/15 keeps 36
  • Zacian (Crowned Sword) 2-2 near-death win: still wins but barely survives, 14 HP left of 192 -- a perfect 15/15/15 keeps 36

Best buddy, vs a non-best-buddy meta

DefDefenseBulkpoint lostMatchups dropped (you-opp)
14165.7Ho-Oh, Ho-Oh (Shadow)-
13164.8Zamazenta (Crowned Shield), Ho-Oh, Gyarados (Shadow), Ho-Oh (Shadow)
12164.0Zamazenta (Crowned Shield), Ho-Oh, Kyogre (Shadow), Gyarados (Shadow), Dragonite (Shadow), Ho-Oh (Shadow)
Close calls (still a win, but the post-match margin shifts enough to matter: a shield spent, a near-death survival, or roughly one fewer charged move of energy banked)
13 Def:
  • Gyarados (Shadow) 2-2 near-death win: still wins but barely survives, 4 HP left of 193 -- a perfect 15/15/15 keeps 35
  • Zamazenta (Crowned Shield) 2-2 near-death win: still wins but barely survives, 23 HP left of 193 -- a perfect 15/15/15 keeps 44
12 Def:
  • Dragonite (Shadow) 0-0 near-death win: still wins but barely survives, 26 HP left of 193 -- a perfect 15/15/15 keeps 47
  • Dragonite (Shadow) 1-1 near-death win: still wins but barely survives, 15 HP left of 193 -- a perfect 15/15/15 keeps 38
  • Gyarados (Shadow) 2-2 near-death win: still wins but barely survives, 4 HP left of 193 -- a perfect 15/15/15 keeps 35
  • Kyogre (Shadow) 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Zamazenta (Crowned Shield) 2-2 near-death win: still wins but barely survives, 23 HP left of 193 -- a perfect 15/15/15 keeps 44
  • Zygarde (Complete Forme) 1-0 near-death win: still wins but barely survives, 16 HP left of 193 -- a perfect 15/15/15 keeps 38

Best buddy, vs a best-buddy meta

DefDefenseBulkpoint lostMatchups dropped (you-opp)
14165.7Zamazenta (Crowned Shield), Gyarados (Shadow)
13164.8Zamazenta (Crowned Shield), Kyogre (Shadow), Gyarados (Shadow), Jirachi, Dragonite (Shadow)
12164.0Zamazenta (Crowned Shield), Kyogre (Shadow), Gyarados (Shadow), Gholdengo, Jirachi, Dragonite (Shadow)
Close calls (still a win, but the post-match margin shifts enough to matter: a shield spent, a near-death survival, or roughly one fewer charged move of energy banked)
14 Def:
  • Gyarados (Shadow) 2-2 near-death win: still wins but barely survives, 4 HP left of 193 -- a perfect 15/15/15 keeps 35
  • Zamazenta (Crowned Shield) 2-2 near-death win: still wins but barely survives, 23 HP left of 193 -- a perfect 15/15/15 keeps 44
  • Zygarde (Complete Forme) 1-0 near-death win: still wins but barely survives, 16 HP left of 193 -- a perfect 15/15/15 keeps 38
13 Def:
  • Dragonite (Shadow) 0-0 near-death win: still wins but barely survives, 26 HP left of 193 -- a perfect 15/15/15 keeps 46
  • Dragonite (Shadow) 1-1 near-death win: still wins but barely survives, 15 HP left of 193 -- a perfect 15/15/15 keeps 37
  • Gyarados (Shadow) 2-2 near-death win: still wins but barely survives, 4 HP left of 193 -- a perfect 15/15/15 keeps 35
  • Kyogre (Shadow) 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Zamazenta (Crowned Shield) 2-2 near-death win: still wins but barely survives, 23 HP left of 193 -- a perfect 15/15/15 keeps 44
  • Zygarde (Complete Forme) 1-0 near-death win: still wins but barely survives, 16 HP left of 193 -- a perfect 15/15/15 keeps 38
12 Def:
  • Dragonite (Shadow) 0-0 near-death win: still wins but barely survives, 25 HP left of 193 -- a perfect 15/15/15 keeps 46
  • Dragonite (Shadow) 1-1 near-death win: still wins but barely survives, 14 HP left of 193 -- a perfect 15/15/15 keeps 37
  • Gyarados (Shadow) 2-2 near-death win: still wins but barely survives, 4 HP left of 193 -- a perfect 15/15/15 keeps 35
  • Kyogre (Shadow) 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Zamazenta (Crowned Shield) 2-2 near-death win: still wins but barely survives, 23 HP left of 193 -- a perfect 15/15/15 keeps 44
  • Zygarde (Complete Forme) 1-0 near-death win: still wins but barely survives, 15 HP left of 193 -- a perfect 15/15/15 keeps 38

HP IVs

HP at a perfect IV: 193 at L51 (best buddy), 192 at L50. Each row drops only that one stat (the other two stay 15); matchups shown are those given up versus a perfect IV.

No best buddy, vs a non-best-buddy meta

HPHPMatchups dropped (you-opp)
14191
13190
12189
Close calls (still a win, but the post-match margin shifts enough to matter: a shield spent, a near-death survival, or roughly one fewer charged move of energy banked)
14 HP:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
13 HP:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
12 HP:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)

No best buddy, vs a best-buddy meta

HPHPMatchups dropped (you-opp)
14191
13190
12189
Close calls (still a win, but the post-match margin shifts enough to matter: a shield spent, a near-death survival, or roughly one fewer charged move of energy banked)
14 HP:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
13 HP:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
12 HP:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)

Best buddy, vs a non-best-buddy meta

HPHPMatchups dropped (you-opp)
14192-
13191
12191
Close calls (still a win, but the post-match margin shifts enough to matter: a shield spent, a near-death survival, or roughly one fewer charged move of energy banked)
14 HP:
  • Necrozma (Dusk Mane) 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
13 HP:
  • Necrozma (Dusk Mane) 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Zygarde (Complete Forme) 1-0 near-death win: still wins but barely survives, 16 HP left of 191 -- a perfect 15/15/15 keeps 38
12 HP:
  • Necrozma (Dusk Mane) 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Zygarde (Complete Forme) 1-0 near-death win: still wins but barely survives, 16 HP left of 191 -- a perfect 15/15/15 keeps 38

Best buddy, vs a best-buddy meta

HPHPMatchups dropped (you-opp)
14192
13191
12191
Close calls (still a win, but the post-match margin shifts enough to matter: a shield spent, a near-death survival, or roughly one fewer charged move of energy banked)
14 HP:
  • Necrozma (Dusk Mane) 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Zygarde (Complete Forme) 1-0 near-death win: still wins but barely survives, 16 HP left of 192 -- a perfect 15/15/15 keeps 38
13 HP:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Necrozma (Dusk Mane) 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Zygarde (Complete Forme) 1-0 near-death win: still wins but barely survives, 15 HP left of 191 -- a perfect 15/15/15 keeps 38
12 HP:
  • Annihilape 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 1 left, was 2)
  • Annihilape 2-2 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Necrozma (Dusk Mane) 2-1 shield spent: keeps the win, but has to spend 1 more shield than a perfect 15/15/15 (now 0 left, was 1)
  • Zygarde (Complete Forme) 1-0 near-death win: still wins but barely survives, 15 HP left of 191 -- a perfect 15/15/15 keeps 38

Every spread with all three IVs from 12 to 15 (the practical range above the 10/10/10 legendary catch floor), sorted so the spreads that drop nothing come first. "Premium" drops no matchups versus a perfect IV in the stated case; everything else lists exactly what it gives up. The first two tables compare against a best-buddied meta (the realistic, harder case); the last two against a non-best-buddied meta, which is strictly easier.

If you best buddy (L51), vs a best-buddy meta

CP and stats at L51; drops measured in the best-buddy vs best-buddy case.

CPIVs (A/D/HP)IV %AtkDefHPDrops vs a perfect IV
478015/15/15100.00%266.3166.5193drops nothing (Premium)
476514/15/1599.68%265.4166.5193drops nothing (Premium)
476815/14/1599.49%266.3165.7193
477015/15/1499.48%266.3166.5192
475013/15/1599.37%264.6166.5193
475314/14/1599.18%265.4165.7193
475514/15/1499.17%265.4166.5192
475915/15/1398.96%266.3166.5191
474915/15/1298.96%266.3166.5191
473813/14/1598.86%264.6165.7193
473913/15/1498.85%264.6166.5192
474414/15/1398.65%265.4166.5191
473414/15/1298.65%265.4166.5191
475815/14/1498.98%266.3165.7192
475615/13/1598.98%266.3164.8193
474114/13/1598.67%265.4164.8193
474214/14/1498.66%265.4165.7192
474415/12/1598.48%266.3164.0193
474715/14/1398.46%266.3165.7191
473715/14/1298.46%266.3165.7191
472913/15/1398.34%264.6166.5191
471913/15/1298.34%264.6166.5191
472914/12/1598.16%265.4164.0193
473214/14/1398.15%265.4165.7191
472214/14/1298.15%265.4165.7191
473512/15/1599.05%263.7166.5193
474515/13/1498.47%266.3164.8192
472613/13/1598.36%264.6164.8193
472713/14/1498.35%264.6165.7192
473014/13/1498.16%265.4164.8192
473315/12/1497.97%266.3164.0192
471313/12/1597.85%264.6164.0193
471713/14/1397.84%264.6165.7191
470713/14/1297.84%264.6165.7191
471814/12/1497.66%265.4164.0192
472312/14/1598.54%263.7165.7193
472412/15/1498.53%263.7166.5192
471513/13/1497.85%264.6164.8192
470313/12/1497.34%264.6164.0192
471412/15/1398.02%263.7166.5191
470312/15/1298.02%263.7166.5191
473515/13/1397.96%266.3164.8191
472515/13/1297.96%266.3164.8191
472014/13/1397.65%265.4164.8191
471014/13/1297.65%265.4164.8191
472315/12/1397.46%266.3164.0191
471215/12/1297.46%266.3164.0191
470814/12/1397.15%265.4164.0191
469714/12/1297.15%265.4164.0191
471012/13/1598.04%263.7164.8193
471212/14/1498.03%263.7165.7192
469812/12/1597.54%263.7164.0193
470212/14/1397.52%263.7165.7191
469212/14/1297.52%263.7165.7191
470513/13/1397.34%264.6164.8191
469513/13/1297.34%264.6164.8191
469313/12/1396.84%264.6164.0191
468213/12/1296.84%264.6164.0191
470012/13/1497.53%263.7164.8192
468812/12/1497.03%263.7164.0192
469012/13/1397.03%263.7164.8191
468012/13/1297.03%263.7164.8191
467812/12/1396.53%263.7164.0191
466812/12/1296.53%263.7164.0191

If you do not best buddy (L50), vs a best-buddy meta

CP and stats at L50; drops measured in the no-best-buddy vs best-buddy case.

CPIVs (A/D/HP)IV %AtkDefHPDrops vs a perfect IV
472415/15/15100.00%264.7165.5192drops nothing (Premium)
471215/14/1599.49%264.7164.7192
471315/15/1499.48%264.7165.5191
470015/13/1598.98%264.7163.9192
470315/15/1398.96%264.7165.5190
470914/15/1599.68%263.9165.5192
470115/14/1498.97%264.7164.7191
468815/12/1598.48%264.7163.0192
468915/13/1498.47%264.7163.9191
469115/14/1398.46%264.7164.7190
469315/15/1298.44%264.7165.5189
467915/13/1397.95%264.7163.9190
469413/15/1599.37%263.0165.5192
469714/14/1599.18%263.9164.7192
469814/15/1499.16%263.9165.5191
467912/15/1599.05%262.2165.5192
468514/13/1598.67%263.9163.9192
467715/12/1497.96%264.7163.0191
468213/14/1598.86%263.0164.7192
468313/15/1498.85%263.0165.5191
468814/15/1398.64%263.9165.5190
466712/14/1598.54%262.2164.7192
466812/15/1498.53%262.2165.5191
467013/13/1598.36%263.0163.9192
465512/13/1598.04%262.2163.9192
468115/14/1297.94%264.7164.7189
466715/12/1397.45%264.7163.0190
466915/13/1297.44%264.7163.9189
468614/14/1498.66%263.9164.7191
467313/15/1398.33%263.0165.5190
467514/13/1498.16%263.9163.9191
467314/12/1598.16%263.9163.0192
467614/14/1398.14%263.9164.7190
467814/15/1298.12%263.9165.5189
465812/15/1398.02%262.2165.5190
466414/13/1397.64%263.9163.9190
465715/12/1296.94%264.7163.0189
467213/14/1498.35%263.0164.7191
465712/14/1498.03%262.2164.7191
465813/12/1597.85%263.0163.0192
466013/13/1497.84%263.0163.9191
466113/14/1397.83%263.0164.7190
466313/15/1297.81%263.0165.5189
466314/12/1497.65%263.9163.0191
464312/12/1597.54%262.2163.0192
464512/13/1497.53%262.2163.9191
464612/14/1397.52%262.2164.7190
464812/15/1297.50%262.2165.5189
464913/13/1397.33%263.0163.9190
463512/13/1397.02%262.2163.9190
466614/14/1297.63%263.9164.7189
464813/12/1497.34%263.0163.0191
465214/12/1397.14%263.9163.0190
465414/13/1297.13%263.9163.9189
463312/12/1497.03%262.2163.0191
465113/14/1297.32%263.0164.7189
463612/14/1297.01%262.2164.7189
463713/12/1396.83%263.0163.0190
463913/13/1296.82%263.0163.9189
464214/12/1296.63%263.9163.0189
462312/12/1396.52%262.2163.0190
462412/13/1296.51%262.2163.9189
462713/12/1296.32%263.0163.0189
461212/12/1296.02%262.2163.0189

If you best buddy (L51), vs a non-best-buddy meta

CP and stats at L51; drops measured in the best-buddy vs no-best-buddy-meta case.

CPIVs (A/D/HP)IV %AtkDefHPDrops vs a perfect IV
478015/15/15100.00%266.3166.5193drops nothing (Premium)
476815/14/1599.49%266.3165.7193drops nothing (Premium)
477015/15/1499.48%266.3166.5192drops nothing (Premium)
475815/14/1498.98%266.3165.7192drops nothing (Premium)
475615/13/1598.98%266.3164.8193
475915/15/1398.96%266.3166.5191
474915/15/1298.96%266.3166.5191
474715/14/1398.46%266.3165.7191
473715/14/1298.46%266.3165.7191
476514/15/1599.68%265.4166.5193
0-0 Mewtwo
475314/14/1599.18%265.4165.7193
0-0 Mewtwo
475514/15/1499.17%265.4166.5192
0-0 Mewtwo
474214/14/1498.66%265.4165.7192
0-0 Mewtwo
474415/12/1598.48%266.3164.0193
474515/13/1498.47%266.3164.8192
473515/13/1397.96%266.3164.8191
472515/13/1297.96%266.3164.8191
474114/13/1598.67%265.4164.8193
0-0 Mewtwo
474414/15/1398.65%265.4166.5191
0-0 Mewtwo
473414/15/1298.65%265.4166.5191
0-0 Mewtwo
473214/14/1398.15%265.4165.7191
0-0 Mewtwo
472214/14/1298.15%265.4165.7191
0-0 Mewtwo
473315/12/1497.97%266.3164.0192
473014/13/1498.16%265.4164.8192
0-0 Mewtwo
472914/12/1598.16%265.4164.0193
0-0 Mewtwo
472014/13/1397.65%265.4164.8191
0-0 Mewtwo
471014/13/1297.65%265.4164.8191
0-0 Mewtwo
472315/12/1397.46%266.3164.0191
471215/12/1297.46%266.3164.0191
471814/12/1497.66%265.4164.0192
470814/12/1397.15%265.4164.0191
469714/12/1297.15%265.4164.0191
475013/15/1599.37%264.6166.5193
473813/14/1598.86%264.6165.7193
473512/15/1599.05%263.7166.5193
473913/15/1498.85%264.6166.5192
472312/14/1598.54%263.7165.7193
472613/13/1598.36%264.6164.8193
472713/14/1498.35%264.6165.7192
472412/15/1498.53%263.7166.5192
472913/15/1398.34%264.6166.5191
471913/15/1298.34%264.6166.5191
471012/13/1598.04%263.7164.8193
471212/14/1498.03%263.7165.7192
471713/14/1397.84%264.6165.7191
470713/14/1297.84%264.6165.7191
471412/15/1398.02%263.7166.5191
470312/15/1298.02%263.7166.5191
471513/13/1497.85%264.6164.8192
471313/12/1597.85%264.6164.0193
470212/14/1397.52%263.7165.7191
469212/14/1297.52%263.7165.7191
470513/13/1397.34%264.6164.8191
469513/13/1297.34%264.6164.8191
469812/12/1597.54%263.7164.0193
470012/13/1497.53%263.7164.8192
470313/12/1497.34%264.6164.0192
469012/13/1397.03%263.7164.8191
468012/13/1297.03%263.7164.8191
469313/12/1396.84%264.6164.0191
468213/12/1296.84%264.6164.0191
468812/12/1497.03%263.7164.0192
467812/12/1396.53%263.7164.0191
466812/12/1296.53%263.7164.0191

If you do not best buddy (L50), vs a non-best-buddy meta

CP and stats at L50; drops measured in the no-best-buddy vs no-best-buddy-meta case.

CPIVs (A/D/HP)IV %AtkDefHPDrops vs a perfect IV
472415/15/15100.00%264.7165.5192drops nothing (Premium)
470914/15/1599.68%263.9165.5192
471315/15/1499.48%264.7165.5191
471215/14/1599.49%264.7164.7192
469413/15/1599.37%263.0165.5192
469814/15/1499.16%263.9165.5191
467912/15/1599.05%262.2165.5192
470115/14/1498.97%264.7164.7191
469714/14/1599.18%263.9164.7192
470015/13/1598.98%264.7163.9192
470315/15/1398.96%264.7165.5190
468313/15/1498.85%263.0165.5191
468614/14/1498.66%263.9164.7191
466812/15/1498.53%262.2165.5191
468815/12/1598.48%264.7163.0192
469115/14/1398.46%264.7164.7190
468213/14/1598.86%263.0164.7192
468514/13/1598.67%263.9163.9192
468814/15/1398.64%263.9165.5190
466712/14/1598.54%262.2164.7192
468915/13/1498.47%264.7163.9191
469315/15/1298.44%264.7165.5189
467213/14/1498.35%263.0164.7191
467314/12/1598.16%263.9163.0192
467614/14/1398.14%263.9164.7190
465712/14/1498.03%262.2164.7191
467715/12/1497.96%264.7163.0191
467013/13/1598.36%263.0163.9192
467514/13/1498.16%263.9163.9191
467814/15/1298.12%263.9165.5189
465512/13/1598.04%262.2163.9192
467915/13/1397.95%264.7163.9190
468115/14/1297.94%264.7164.7189
465813/12/1597.85%263.0163.0192
466314/12/1497.65%263.9163.0191
464312/12/1597.54%262.2163.0192
466715/12/1397.45%264.7163.0190
467313/15/1398.33%263.0165.5190
465812/15/1398.02%262.2165.5190
466113/14/1397.83%263.0164.7190
466313/15/1297.81%263.0165.5189
466414/13/1397.64%263.9163.9190
466614/14/1297.63%263.9164.7189
464612/14/1397.52%262.2164.7190
464812/15/1297.50%262.2165.5189
465214/12/1397.14%263.9163.0190
466013/13/1497.84%263.0163.9191
464512/13/1497.53%262.2163.9191
466915/13/1297.44%264.7163.9189
464813/12/1497.34%263.0163.0191
464913/13/1397.33%263.0163.9190
465113/14/1297.32%263.0164.7189
463312/12/1497.03%262.2163.0191
463512/13/1397.02%262.2163.9190
463612/14/1297.01%262.2164.7189
465715/12/1296.94%264.7163.0189
463713/12/1396.83%263.0163.0190
462312/12/1396.52%262.2163.0190
465414/13/1297.13%263.9163.9189
464214/12/1296.63%263.9163.0189
463913/13/1296.82%263.0163.9189
462412/13/1296.51%262.2163.9189
462713/12/1296.32%263.0163.0189
461212/12/1296.02%262.2163.0189

Method and caveats

Format adapted from XehrFelrose's Master League IV deep dives; numbers independently simulated. Generated by scripts/iv_envelope_analysis.py + scripts/render_iv_envelope_article.py.
Battle engine is a Python port of PvPoke; all game data from PvPoke by Empoleon_Dynamite (MIT license). This project would not exist without it.