Rainbow Energy (HeartGold & SoulSilver 104/123)

Rules

Attach Rainbow Energy to 1 of your Pokémon. While in play, Rainbow Energy provides every type of Energy but provides only 1 Energy at a time. (Has no effect other than providing Energy.) When you attach this card from your hand to 1 of your Pokémon, put 1 damage counter on that Pokémon. (While not in play, Rainbow Energy counts as Colorless Energy.)