Overgrow
Strengthens Grass moves to inflict 1.5× damage at 1/3 max HP or less.
Full effect
When this Pokémon has 1/3 or less of its HP remaining, its Grass-type moves inflict 1.5× as much regular damage.
In-game description
Powers up Grass-type moves when the Pokémon's HP is low.
Stats
Regular ability (27 Pokémon)
Hidden ability (2 Pokémon)
Only available through specific encounters (Dynamax Adventures, Tera Raids, hidden grottoes, etc.).