Darkness Energy is a Rare card from the Aquapolis set, numbered 142 out of 147. In the Pokémon Trading Card Game, it serves as a special energy card that provides energy for Darkness-type Pokémon. Currently valued at $8.32, its price reflects its desirability among collectors, especially for those focusing on energy cards from the early 2000s era. The Aquapolis set is known for its diverse range of cards, making this particular energy card a notable inclusion.