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.)

Darkness Energy
Neo Genesis 104 · Energy · Special
StandardNot legal
Regulation marknone
RarityRare
Standard uses regulation marks H and later, plus identical reprints of legal cards.
Released December 16, 2000.
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Build with this card
The Pokémon deck builder checks every deck against the Standard rules, and Genny can build one around Darkness Energy.
Open the deck builder