This card can only be attached to a Single Strike Pokmon. If this card is attached to anything other than a Single Strike Pokmon, discard this card.
As long as this card is attached to a Pokmon, it provides Fighting and Darkness Energy but provides only 1 Energy at a time, and the attacks of the Pokmon this card is attached to do 20 more damage to your opponent's Active Pokmon (before applying Weakness and Resistance).
