Omastar

Apparently, it cracked Shellder's shell with its sharp fangs and sucked out the insides.

Squeeze (10+): Flip a coin. If heads, this attack does 10 damage plus 20 more damage and the Defending Pokémon is now Paralyzed. If tails, this attack does 10 damage.

Spike Barrage (20+): Flip a number of coins equal to the number of Energy attached to Omastar. This attack does 20 damage plus 20 more for each heads.