Skorupi

It grips prey with its tail claws and injects poison. It tenaciously hangs on until the poison takes.

Stalk (10): The Defending Pokémon can't retreat during your opponent's next turn.

Dangerous Claw (20): Flip a coin. If heads, the Defending Pokémon is now Paralyzed. If tails, the Defending Pokémon is now Poisoned.