Aftermath is an ability introduced in Generation IV. So far, 3 Pokémon have this ability.
If the bearer of Aftermath faints due to a contact move, that move's user loses 1/4 of its max HP (unless they have Damp)
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As of version 1.0.3, Aftermath triggers after any move that makes contact instead of just knockout blows. Click here for more info on known bugs.
Outside of battle
Aftermath has no effect outside of battle.
Pokémon with Aftermath