Overgrow

Strengthens Grass moves to inflict 1.5× damage at 1/3 max HP or less.

29 Pokémon2 as Hidden AbilityIntroduced in Gen 3

One of the original abilities, from Gen 3 (Ruby & Sapphire).

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In-depth effect

When this Pokémon has 1/3 or less of its HP remaining, its Grass-type moves inflict 1.5× as much regular damage.

Pokémon that can have Overgrow only as their Hidden Ability.

Other abilities introduced alongside Overgrow.

Ability	Pokémon	Effect
Swift Swim	44	Doubles Speed during rain.
Sturdy	42	Prevents being KOed from full HP, leaving 1 HP instead. Protects against the one-hit KO moves regardless of HP.
Keen Eye	39	Prevents accuracy from being lowered.
Chlorophyll	37	Doubles Speed during strong sunlight.
Inner Focus	35	Prevents flinching.
Intimidate	35	Lowers opponents' Attack one stage upon entering battle.
Levitate	32	Evades Ground moves.
Swarm	31	Strengthens Bug moves to inflict 1.5× damage at 1/3 max HP or less.

No reader notes on Overgrow yet.

“Overgrow”. Pokémonism. Retrieved [date] from pokemonism.com/abilities/overgrow.

Ability data from PokéAPI.