Team Magma vs Team Aqua is a set in the EX series. It was released on March 1, 2004. The printed size is 95. This checklist is longer, at 97 cards. Aqua Energy is 86/95, in position 86 of 97 on this checklist. Before it is 85 Warp Point, and after it is 87 Magma Energy. The listed rarity is Uncommon.
Aqua Energy is an Energy card. It is listed as Special.
Takumi Akabane illustrated this card. The same name is on 51 other cards in the catalog.
The card text says: Aqua Energy can be attached only to a Pokémon with Team Aqua in its name. Aqua Energy provides Water and Darkness Energy but provides 2 Energy at a time. (Doesn't count as a basic Energy card when not in play and has no other effect than providing Energy.) At the end of your turn, discard Aqua Energy.
I keep a set binder for Team Magma vs Team Aqua, meant to hold every card of that set. This card is one slot in the Team Magma vs Team Aqua set binder. I still need this card.