Swarm (ability)

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 the leading 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
O.Ruby​/​A.Sapphire
Powers up Bug-type moves when the Pokémon is in trouble.
Sun​/​Moon
Ultra Sun​/​Ultra Moon
Powers up Bug-type moves when the Pokémon’s HP is low.

Other languages

English Swarm
Japanese むしのしらせ (Mushi no Shirase)
German Hexaplaga
French Essaim
Italian Aiutinsetto
Spanish Enjambre