Verified · Reg M-B

The numbers agree
with Smogon.

Every damage roll ChampDex shows gets diffed against @smogon/calc every day. STAB, types, weather, terrain, abilities, items — all of it. If we disagree, it's documented with a source.

●last_verified2026-07-20 03:34 UTC|smogon_pin0.11.0-champions
94%
Match rate · 369/394
● Zero unexpected drift
394
Total scenarios
94%
Match rate
25
Known diffs
0
Unexpected
02

Coverage

60
Damage-relevant abilities
Each one ported from Bulbapedia or Serebii with a source link in ability-effects.ts
740
Move flags synced
contact · punch · pulse · bite · slicing · sound · wind · bullet · recoil — updated 2026-04-19
0.11.0-champions
Reference calc pin
Smogon master build, rebuilt nightly against our parity suite
03

Documented divergences

These scenarios intentionally produce different numbers from Smogon's reference. Each cites Serebii / Bulbapedia where our reading of Champions behavior beats Smogon's current implementation.

  1. 01
    attacker-ability/Galvanize/extreme-speed
    Smogon's Champions mechanics omit Galvanize from the -ate list; ours applies per Serebii.
    ours 28–33·theirs 23–28
  2. 02
    attacker-ability/Overgrow/bullet-seed
    Multi-hit reporting style differs (Bullet Seed 2-5 hits).
    ours 6–20·theirs 9–12
  3. 03
    defender-ability/Ice Scales/dark-pulse
    Smogon omits Ice Scales (~0.5 special) in its Champions mechanics file; ours applies per Serebii.
    ours 19–23·theirs 39–46
  4. 04
    defender-ability/Shadow Shield/extreme-speed
    Smogon omits Shadow Shield (≡ Multiscale) in its Champions mechanics; ours applies.
    ours 18–21·theirs 36–43
  5. 05
    defender-ability/Fluffy/close-combat
    Smogon omits Fluffy in Champions mechanics; ours halves contact damage per Serebii.
    ours 13–15·theirs 26–31
  6. 06
    defender-ability/Fluffy/flamethrower
    Smogon omits Fluffy in Champions mechanics; ours doubles fire damage per Serebii.
    ours 42–52·theirs 21–26
  7. 07
    defender-ability/Intimidate/close-combat
    Auto-apply defender Intimidate is a UX choice; Smogon requires manual -1 atk.
    ours 18–21·theirs 26–31
  8. 08
    item/Hard Stone/stone-edge
    Compound modifier rounding on a ≥200-damage roll; 1.8% drift within chain-order precision.
    ours 180–212·theirs 182–216
  9. 09
    item/Life Orb/flare-blitz
    Smogon's Champions mechanics omit Life Orb; ours applies ×1.3 per the Reg M-B items catalog.
    ours 51–60·theirs 39–47
  10. 10
    item/Muscle Band/close-combat
    Smogon's Champions mechanics omit Muscle Band; ours applies ×1.1 to physical moves per the Reg M-B items catalog.
    ours 42–50·theirs 38–45
  11. 11
    item/Wise Glasses/flamethrower
    Smogon's Champions mechanics omit Wise Glasses; ours applies ×1.1 to special moves per the Reg M-B items catalog.
    ours 30–36·theirs 27–33
  12. 12
    item/Light Ball/thunderbolt
    Smogon's Champions calc doesn't apply Light Ball; ours doubles Pikachu attack per Serebii.
    ours 63–75·theirs 31–37
  13. 13
    item/Yache Berry/icicle-spear
    Multi-hit reporting style differs.
    ours 44–140·theirs 110–140
  14. 14
    multihit/bullet-seed
    Multi-hit reporting style differs: ours shows min(1)-max(5) range, Smogon shows deterministic 3.
    ours 26–80·theirs 39–48
  15. 15
    multihit/icicle-spear
    Multi-hit reporting style differs: ours shows min(1)-max(5) range, Smogon shows deterministic 3.
    ours 104–320·theirs 156–192
  16. 16
    tera/defender-resist
    Smogon's Champions calc omits tera; ours swaps defensive types per mainline rules.
    ours 38–45·theirs 76–91
  17. 17
    item/Expert Belt SE/close-combat
    Smogon's Champions mechanics omit Expert Belt; ours applies mainline ×1.2 on super-effective hits.
    ours 324–384·theirs 268–324
  18. 18
    combo-atk/Overgrow/venusaur/bullet-seed
    Multi-hit reporting style differs.
    ours 6–20·theirs 9–12
  19. 19
    combo-def/Prism Armor/play-rough
    Smogon's Champions calc doesn't check Prism Armor; ours applies ×0.75 on SE.
    ours 60–72·theirs 80–96
  20. 20
    combo-def/Ice Scales/dark-pulse
    Smogon omits Ice Scales; ours applies per Serebii.
    ours 19–23·theirs 39–46
  21. 21
    combo-def/Shadow Shield/extreme-speed
    Smogon omits Shadow Shield.
    ours 18–21·theirs 36–43
  22. 22
    combo-def/Fluffy/close-combat
    Smogon omits Fluffy.
    ours 13–15·theirs 26–31
  23. 23
    combo-def/Intimidate/close-combat
    Auto-apply defender Intimidate (UX choice).
    ours 18–21·theirs 26–31
  24. 24
    combo-def/Storm Drain/waterfall
    Smogon's Champions calc uses Storm Drain only to redirect; ours treats as type immunity (mainline dual-effect).
    ours 0–0·theirs 18–21
  25. 25
    combo-item/Hard Stone/stone-edge
    Compound rounding on a ≥200-damage roll.
    ours 180–212·theirs 182–216
04

How it stays current

●dailyGitHub Actions pulls Smogon's damage-calc master, rebuilds, re-runs the parity suite. Any drift opens a PR.
●dailyscrape-move-flags.mjs refreshes move flags from Bulbapedia's categorical indexes and pushes to Firestore.
●cont.CI blocks any calc commit that introduces an unexpected disagreement with Smogon's reference.
See a number you don't trust?

If our calc disagrees with what you see in-game, that's a bug we want to fix. Not something to argue about.

Report a mismatch
← back to calcsmogon/champions.ts

Pokémon Champions Damage Calculator

ChampDex is a free Pokémon Champions damage calculator built for the Reg M-B format. It runs the exact Champions damage formula, Stat Points instead of EVs, Level 50, Mega Evolution, weather, items, and spread moves, and it shows every modifier so you can trust the KO range. The numbers are parity-verified against Smogon's calculator every day.

Frequently asked questions

How do I calculate damage in Pokemon Champions?
Pokemon Champions uses a stat-point system instead of traditional EVs. Damage depends on the attacker's level (always 50), its Attack or Special Attack stat, the move's base power, and the defender's matching defense, multiplied by STAB, type effectiveness, weather, crit, and spread modifiers. The ChampDex calculator runs the full Champions-accurate formula so you trust every KO range in Reg M-B.
What is STAB in Pokemon Champions?
STAB (Same-Type Attack Bonus) is a 1.5x multiplier applied when a Pokemon uses a move of a type matching one of its own types. Adaptability makes it 2x. The calculator applies STAB automatically based on the attacker's types.
Does Pokemon Champions use EVs or stat points?
Pokemon Champions uses a stat-point system with a 66-point total budget and a 32-point per-stat cap. Each stat point adds 1 to the final stat at Level 50. The ChampDex calculator supports stat points directly, and the EV Converter tool translates Smogon EV spreads into Champions equivalents using the official 4-EVs-for-the-first-SP / 8-EVs-per-extra-SP conversion rule.
Is this damage calculator accurate for Champions tournaments?
Yes. The ChampDex calculator uses the exact damage formula verified from Serebii and Bulbapedia for Reg M-B, the current Champions format. It handles STAB, weather (Rain/Sun/Sand/Snow), crit, spread-move reduction (0.75x for Doubles multi-target moves), and stat stages. All modifiers are shown in the breakdown so you can verify every step.
Does the calculator support Mega Evolution?
Yes. Mega Evolution is the only battle gimmick legal in Reg M-B, and the calc fully supports Mega forms — switch to Mega Charizard Y, Mega Gardevoir, or any other Champions-legal Mega and the boosted stats, changed ability, and updated typing all apply automatically.
Does the calculator support Terastallization?
Not yet. Terastallization isn't legal in Reg M-B (Champions is Mega-only), so the Tera controls are hidden to avoid producing damage numbers the game can't reproduce. When Tera becomes legal in a future regulation, the damage formula already supports it and the UI will unhide automatically.
Is the Pokemon Champions calculator free?
Yes. The ChampDex damage calculator is free, requires no login or account, has zero paywalls, and no ads. All features are unlocked for everyone.