Torrent

When Pokémon with this ability are at 1/3 HP or less, all of their Water-type moves will have 50% more power.

Related Abilities

Blaze is a Fire-type equivalent.
Overgrow is a Grass-type equivalent.
Swarm is a Bug-type equivalent.

Pokémon	Type	Tier	Abilities	HP	Atk	Def	SpA	SpD	Spe	BST
Blastoise	Water	UU	Torrent	79	83	100	85	105	78	530
Feraligatr	Water	UU	Torrent	85	105	100	79	83	78	530
Swampert	Water / Ground	OU	Torrent	100	110	90	85	90	60	535