Swarm (ability)

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Effect

Swarm increases the power of Bug-type moves by 50% (1.5×) when the ability-bearer's HP falls below a third of its maximum (known in-game as in a pinch).

Outside of battle

If a Pokémon with Swarm is leading the party Pokémon, wild Pokémon are twice as likely to appear.

Game descriptions

Ruby/Sapphire
FireRed/LeafGreen
Emerald
Ups BUG moves in a pinch.
Diamond/Pearl
Platinum
HeartGold/SoulSilver
Powers up Bug-type moves in a pinch.
Black/White
Black 2/White 2
Powers up Bug-type moves in a pinch.
X/Y Powers up Bug-type moves when the Pokémon is in trouble.