Air Balloon
The Retreat Cost of the Pokemon this card is attached to is ColorlessColorless less.
Card rule
You may attach any number of Pokémon Tools to your Pokémon during your turn. You may attach only 1 Pokémon Tool to each Pokémon, and it stays attached.
Card rule
Attach a Pokémon Tool to 1 of your Pokémon that doesn't already have a Pokémon Tool attached.
Black Bolt