Water Absorb

A Pokémon with Water Absorb heals 1⁄4 of its maximum HP when hit by a Water-type attack.

Game descriptions

Ruby, Sapphire, FireRed, LeafGreen, Emerald:Changes water into HP.
Diamond, Pearl, Platinum, HeartGold, SoulSilver:Restores HP if hit by a Water-type move.
Black, White, Black 2, White 2:Restores HP if hit by a Water-type move.
X, Y, O.Ruby, A.Sapphire:Restores HP if hit by a Water-type move.
Sun, Moon, Ultra Sun, Ultra Moon:Restores HP if hit by a Water-type move, instead of taking damage.
Sword, Shield, B.Diamond, S.Pearl:Restores HP if hit by a Water-type move instead of taking damage.
Scarlet, Violet:If hit by a Water-type move, the Pokémon has its HP restored instead of taking damage.