Swarm

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).

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.
Sword
Shield
B.Diamond
S.Pearl
Powers up Bug-type moves when the Pokémon’s HP is low.

Other languages

EnglishSwarm
SpanishEnjambre
ItalianAiutinsetto
Japaneseむしのしらせ (Mushi no Shirase)
GermanHexaplaga
FrenchEssaim