Rainbow Energy is an Energy card. It is listed as Special.
Rainbow Energy sits at 144/147 in Aquapolis, position 144 of 182. Before it is 143 Metal Energy, and after it is 145 Boost Energy. The set belongs to the E-Card series. It was released on January 15, 2003. The printed size is 147. This checklist is longer, at 182 cards. The listed rarity is Rare.
The card text says: 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. (Doesn't count as a basic Energy card when not in play.) When you attach this card from your hand to 1 of your Pokémon, put 1 damage counter on that Pokémon.
The illustrator line reads Takumi Akabane. I count 51 other cards in the catalog with that illustrator.
Aquapolis set binder is where a full Aquapolis set goes. This card fills one slot there. I still need this card.