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This ability allows the Pokémon that is using it to raise its Bug-type moves by 50% if the Pokémon using it has less than one-third of its maximum HP.
Outside of battle, if the Pokémon leading the party has Swarm, the chance of encountering wild Pokémon increases from Pokémon Emerald onwards.
If a Pokémon with Swarm is below 25% of its HP, its Bug-type moves hit for double damage.
Pokémon with Swarm