Nidoking 31

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. Damage: 30+

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). Damage: 20