Darkness Energy (MODEXP 158)

If the Pokémon Darkness Energy is attached to does damage with an attack (after applying Weakness and Resistance), the attack does 10 more damage. At the end of every turn, put 1 damage counter on the Pokémon Darkness Energy is attached to, unless it's . Darkness Energy provides Energy. (Doesn't count as a basic Energy card.)

Darkness Energy Pokémod Expedition 158