Primal Swirl

Once during your turn, when you play Omastar from your hand to evolve 1 of your Pokémon, you may remove the highest Stage Evolution card from each of your opponent's Benched Evolved Pokémon and put those cards back into his or her hand. You can't use more than 1 Primal Swirl Poké-Power each turn.

Send Back

Your opponent switches the Defending Pokémon with 1 of his or her Benched Pokémon.

It is thought that this Pokémon became extinct because its spiral shell grew too large.