Cool Porygon 15

You may change Cool Porygon's Resistance to a type of your choice other than Colorless. If the Defending Pokémon has a Weakness, you may change it to a type of your choice other than Colorless. (Benching either Pokémon ends the effect on that Pokémon.) Damage:

Flip 3 coins. This attack does 20 damage times the number of heads. Damage: 20×