Omastar

Omastar's sharp fangs could crush rock, but the Pokémon can attack only the prey that come within reach of its tentacles.

Ability — Primordial Tentacles: As long as this Pokémon is in the Active Spot, your opponent's Active Pokémon can't retreat.

Aqua Split (90): This attack also does 30 damage to 2 of your opponent's Benched Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)