Swarm (ability)

Swarm is an ability was introduced in Generation 3. This ability is exclusive to Bug-Type Pokémon. This Ability has 3 variants: Overgrow, which affects Grass-type Attacks, Blaze for Fire-type Attacks and Torrent for Water-type Attacks.

In Battle
A Pokémon with this Ability increases the power of its Bug-Type Moves by 1.5 times, or 50%, when less than or equal to 1/3 of its maximum HP (which is called "in a pinch" in-game).

Outside of Battle
If a Pokémon with the ability Swarm is set in the front (even if fainted), the wild encounter rate will be doubled.

Trivia

 * Between this Ability and its variants, Swarm is the only Ability that none of the Starter Pokémon have.
 * Also, Swarm has the most Pokémon that have this Ability, with 12, while Torrent has the least amount of Pokémon that have this Ability, with only 4.
 * All three of Swarm's variants are the Abilities mainly associated with the Starter Pokémon, although they aren't exclusive to them.
 * Swarm is also the only one that has an effect outside of Battle.