Sap Sipper

Boosts Attack when hit by a Grass-type move.

Game descriptions

Black, White, Black 2, White 2:Boosts Attack when hit by a Grass-type move.
X, Y, O.Ruby, A.Sapphire:Boosts the Attack stat when hit by a Grass-type move.
Sun, Moon, Ultra Sun, Ultra Moon:Boosts the Attack stat if hit by a Grass-type move, instead of taking damage.
Sword, Shield, B.Diamond, S.Pearl:Boosts the Attack stat if hit by a Grass-type move instead of taking damage.
Scarlet, Violet:The Pokémon takes no damage when hit by Grass-type moves. Instead, its Attack stat is boosted.