Sap Sipper is an ability introduced in Generation V. So far, 2 Pokémon have this ability.
When the Pokémon with Sap Sipper is hit by a Grass-type move, its Attack is increased by one stage, and the move will have no effect on that Pokémon. Multi-strike moves, such as Bullet Seed, will only increase the Pokémon's Attack once.
Outside of battle
Sap Sipper has no effect outside of battle.
Pokémon with Sap Sipper