|Any Pokémon that hears this song faints in three turns, unless it switches out of battle.|
All Pokémon on the field when Perish Song is used gain a perish count, except Pokémon with the AbilitySoundproof and Pokémon that already have a perish count. Starting at 4 on the turn Perish Song is used, the perish count decreases by 1 at the end of each turn (including the turn Perish Song is used in). When a Pokémon's perish count reaches 0, it faints.
If an affected Pokémon switches out with Baton Pass, the perish count will be transferred to the Pokémon switched in, even if it has the Ability Soundproof. If it switches out in any other way, neither it nor the switched-in Pokémon will have a perish count.
Since it does not do damage, Perish Song is unaffected by items such as the Focus Sash and Abilities such as Magic Guard and Sturdy.