Houndoom

Ambush (10+): Flip a coin. If heads, this attack does 10 damage plus 20 more damage.

Lonely Fang (30+): This attack does 30 damage plus 20 damage times the number of your opponent's Benched Pokémon minus the number of your Benched Pokémon. (For example, if your opponent has 3 Benched Pokémon and you have 1, this attack will do 30 damage plus 40 more damage.)