Nidoking

Uses its powerful tail in battle to smash, constrict, then break its prey's bones.

Thrash (30): Flip a coin. If heads, this attack does 30 damage plus 10 more damage; if tails, this attack does 30 damage and Nidoking does 10 damage to itself.

Toxic (40): The Defending Pokémon is now Poisoned. It now takes 20 Poison damage instead of 10 after each player's turn (even if it was already Poisoned).