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
or has Dark in its name.
Darkness Energy provides
Energy. (Doesn't count as a basic Energy card.)
Episode 963 The Promise Between Ash and Pikachu
Episode 964 It is Time for Litten to Set Off!!