Battle Lab

Set up two sides and let Pokémon Showdown's own engine play the battle thousands of times, right in your browser. See how often each side wins, how long it takes and what decides it.

Mechanics

Battle

Showdown's Gen 4 Custom Game: no tiers and no level rules. Any level from 1 to 100, and any Pokémon, item and move Gen 4 has.

Side A1/6

How Side A plays

Plays like the Hard computer opponent: KOs, priority to finish, safe setup, recovery, hazards, switching out of bad matchups and Tera. It reads the other side only as it has been revealed.

On Side A's side at the start

SpikesToxic Spikes

Side B1/6

How Side B plays

Plays like the Hard computer opponent: KOs, priority to finish, safe setup, recovery, hazards, switching out of bad matchups and Tera. It reads the other side only as it has been revealed.

On Side B's side at the start

SpikesToxic Spikes

Side A · PiplupLead

Loading Gen 4 data…

How it starts the battle

HP%

Status

Stat stages

AtkDefSpASpDSpeAccEva

Set once the leads are out (so Intimidate and weather abilities have already happened).

Its moves

Side A plays Smart, so the strategy picks each move. Switch the side to Scripted to set a fixed order.

The field at the start

Weather

Hazards and screens are set on each side above.

Battles

Seed for the next run

Every battle is a real one on Pokémon Showdown's simulator, played right here in your browser. Each battle's randomness comes from the run's seed, so the same seed and setup always give the same result. Battles still going at turn 300 count as draws.