Darkness Energy is an Energy card. It is listed as Special.
Darkness Energy sits at 142/147 in Aquapolis, position 142 of 182. Before it is 141 Weakness Guard, and after it is 143 Metal 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: If the Pokémon Darkness Energy is attached to damages the Defending Pokémon (after applying Weakness and Resistance), the attack does 10 more damage to the Defending Pokémon. At the end of every turn, put 1 damage counter on the Pokémon Darkness Energy is attached to, unless it's Darkness or has Dark in its name. Darkness Energy provides Darkness Energy. (Doesn't count as a basic Energy card.)
The illustrator line reads Milky Isobe. I count 22 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.
If the Pokémon Darkness Energy is attached to damages the Defending Pokémon (after applying Weakness and Resistance), the attack does 10 more damage to the Defending Pokémon. At the end of every turn, put 1 damage counter on the Pokémon Darkness Energy is attached to, unless it's Darkness or has Dark in its name. Darkness Energy provides Darkness Energy. (Doesn't count as a basic Energy card.)
Aquapolis, in the E-Card series. It was released on January 15, 2003. The printed size is 147.
142/147. It is entry 142 of 182 in this checklist.
Milky Isobe. The catalog lists 22 other cards with that illustrator.
Rare.