Sap Sipper

Absorbs Grass moves, raising Attack one stage.

Full effect

Whenever a Grass-type move hits this Pokémon, its Attack rises one stage, negating any other effect on it.

In game description

The Pokémon takes no damage when hit by Grass-type moves. Instead, its Attack stat is boosted.

Pokemon with Sap Sipper

Using Sap Sipper in Cobblemon

Abilities are passive and always active, so Sap Sipper costs you nothing to run. If it is marked hidden on a species above, expect it to be harder to obtain: servers differ in whether hidden abilities come from breeding, an Ability Patch, or events.

See the Pokedex for which abilities each species can have, and IVs, EVs and breeding for how to actually pass one down.