Mr. Mime

Put a coin next to your Active Pokémon without showing your opponent and cover it with your hand. Your opponent guesses if the coin is heads or tails. If he or she is wrong, this attack does 50 damage to the Defending Pokémon. If he or she is right, Mr. Mime does 20 damage to itself, and this attack's damage isn't affected by Weakness or Resistance.

Kagemaru Himeno