Blaze (ability)

Overgrow is an Ability introduced in Generation III. In Pokémon Beryl, it is exclusive to the Grass-type Starter Pokémon of the Ruimor region.

Effect
When a Pokémon with Overgrow uses a Grass-type move, the move's power will be increased by 50% if the user has less than or equal to ⅓ of its maximum HP remaining.