Meaning: Superpowerful Claws)is a Pokémon ability introduced in the third generation. It prevents the loss in Attack.
Hyper Cutter prevents other Pokémon from lowering the Attack of the Pokémon with this ability. It does not prevent stat decreases that are self-inflicted like with Superpower. It also does not protect against moves that swap stats like Power Split and Heart Swap.
In Pokémon Emerald, if a Pokémon with Hyper Cutter used Cut on Tall Grass, it would reach 2 spaces away instead of just one. This ability was lost in future generations due to Cut no longer being able to cut Tall Grass.