VGC damage calculator for Doubles

A VGC calc has a harder job than a singles one. Four Pokémon are on the field, spread moves hit more than one of them at reduced power, Intimidate and Tailwind land before you get to attack, and the question you actually care about is rarely "how much does this move do" — it is "who on my side threatens who on theirs, and what kills me back".

This calculator answers the second question directly: paste both teams and it prints two 6×6 matrices, one for each direction, showing every Pokémon's best move, the percentage of the target's HP, and the KO count.

What it accounts for

• The spread modifier. Every calculation runs in Doubles, so allAdjacent and allAdjacentFoes moves take the ×0.75 automatically. Earthquake into one target really is weaker than a single-target move of the same base power, and the matrix shows that rather than hiding it.
• Speed control. The Speed tab lines up all twelve Pokémon at once with Tailwind (per side), Trick Room (reverses the order), Choice Scarf, paralysis — ×¼ in Gens ≤6 and ×½ from Gen 7 — and the weather Speed abilities: Swift Swim, Chlorophyll, Sand Rush and Slush Rush.
• Field conditions. Weather, Reflect and Light Screen, applied to the whole matrix so you can flip a screen on and read every cell again.
• Stat stages and status. Swords Dance, Nasty Plot, Intimidate and the rest as per-Pokémon modifiers; burn halves physical damage.
• Items and abilities from each pasted set — Choice items, Life Orb, Assault Vest, Huge Power, Adaptability, Technician, Sheer Force and so on, straight from the engine.

Which generations

Gen 5 (B/W) through Gen 9 (S/V) are all selectable, with generation-specific mechanics honoured — Knock Off's Gen 6 base-power buff, the paralysis Speed change, and so on. Pokémon Champions is its own selectable ruleset on top of Gen 9 mechanics; see how Champions Stat Points work.

Does it match the Showdown calculator?

The engine is @smogon/calc — the same one the Showdown damage calculator runs on — so Gen 5–9 numbers match it. The project's unit tests reconstruct the damage formula independently and assert it against the engine on every commit, across STAB, type effectiveness, weather, spread, Choice and Life Orb items, stat stages, burn and every supported generation.

Precomputed matchups

If you just want a number without pasting anything, the matchup index has hundreds of common attacker-versus-defender calculations worked out already, each with a link that opens it in the live calculator.