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