Fan Translation: Induced Explosion) is an ability introduced in the fourth generation. It causes damage to the foe landing landing the hit that knockouts the Pokémon.
If a Pokémon with Aftermath faints from a contact move, the attacking Pokémon loses a quarter of its maximum health. Aftermath does not activate if a Pokémon with Damp is on the field.
In the Pokémon Mystery Dungeon series, occasionally if the Pokémon with this ability faints, it causes a blast similar to explosion, taking away half the health of teammates in its radius and 40 HP of hostile Pokémon.