Pokémon Ability

Swarm

Powers up Bug-type moves when the Pokémon's HP is low.

In-depth effect

When HP is below 1/3rd its maximum, power of Bug-type moves is increased by 50%.

Pokémon with Swarm

2 Pokémon known to have Swarm (Gen 9 dataset)

Lokix

Nymble

About the Swarm ability

Swarm is one of 112+ abilities in Pokémon Scarlet and Violet. Each Pokémon has one active ability at a time, drawn from a list of 1-3 possible abilities per species (the third slot, when present, is the Hidden Ability — only accessible via Tera raids, Mass Outbreaks, or Ability Patch).

Official game text: Powers up Bug-type moves when the Pokémon's HP is low.

How it works: When HP is below 1/3rd its maximum, power of Bug-type moves is increased by 50%.

How to get a Pokémon with Swarm

If Swarm is a regular ability (not Hidden Ability), simply catch the Pokémon and it has a 50% chance per slot of having Swarm. You can use an Ability Capsule (50 BP at Chansey Supply) to swap between regular ability slots. If Swarm is the Hidden Ability of one of the 2 Pokémon listed above, you'll need either:

To catch the Pokémon from a 5-star or 6-star Tera raid
To use an Ability Patch (consumable from picnic crafting / raid rewards) on a Pokémon that already has Swarm as a regular ability
To transfer a Pokémon with Hidden Ability via Pokémon HOME from older games

For the full list of abilities and their competitive impact, see our abilities reference. To check how an ability affects damage calculations, use our damage calculator.