What it does
Perish Song gives every Pokémon currently on the field a counter starting at 3. The counter drops by one at the end of each turn. When any Pokémon's counter hits zero, it faints immediately.
The escape clause: switching out clears the counter. A Pokémon that leaves the field loses its count. Incoming Pokémon are unaffected. This makes Perish Song not an unavoidable kill condition, but a 'switch within three turns or die' forced pressure — and that framing tells you how to use it.
Baton Pass transmits the counter to the recipient. Perish Song cannot be copied by Mimic.
In doubles, the math is stark: one move, two simultaneous clocks on both opposing Pokémon. If they don't switch, both faint. If they do switch, the replacements are clean — but you've forced them to reveal and reposition mid-game, and your partner can act freely while they scramble. The user needs to switch out before its own counter expires, which resets the user's clock without helping the opposing Pokémon.
Who runs it
Politoed at 55% uses it as a tempo disruptor alongside rain support. Its high Special Defense gives it the turns to fire Perish Song off and then operate normally before needing to switch out.
Altaria at 49% deploys it as a standoff-breaker. Opposing defensive walls that are hard to directly KO suddenly have a timer — they switch or die, and either way the matchup shifts.
Primarina at 5% is the niche support case — strong Special Defense lets it absorb hits while managing the timing. Against specific walls it can't break conventionally, Perish Song forces the switch.
How to use it
The standard sequence in doubles: use Perish Song on turn one of a standoff. Let your partner handle normal battle operations. When the user's counter reaches 1, switch it out — the counter clears for your Pokémon, and the two opposing counters continue ticking down.
Forced switch application: face a defensive wall you can't break? Perish Song announces a death sentence. The opponent is forced to switch, exposing their next threat, which your partner can position against.
Late-game scenario: if both sides are running low on Pokémon, Perish Song's timer shifts the win condition. If the opponent can't KO you before the timer reaches zero, you both go down together — which might change a losing position to a tie.
Tips & strategy
Managing your own switch is where players slip up. Switch out when the counter reads 1, not 0 — at 0 it's too late. Don't switch out too early either, since the pressure of the clock is the whole point.
In doubles, Protect on your partner gives your Perish Song user an extra turn of breathing room before needing to switch out, extending how long the pressure stays active.
Perish Song doesn't affect Pokémon that switch in fresh — only those on the field when it was used. Don't expect it to work against heavy-rotation teams that rotate freely; it's best against teams or positions that are locked in and unwilling to give up their positioning.