Giovanni's Nidoking

Intimidate

If the Defending Pokémon's maximum HP is 50 or less, it can't attack Giovanni's Nidoking during your opponent's next turn. (Benching or evolving either Pokémon ends this effect.)

Tumbling Attack40

Flip a coin. If heads, this attack does 40 damage plus 30 more damage; if tails, this attack does 40 damage.