Dangerous Energy (Mirror Holofoil)

This card can only be attached to [Darkness] Pokémon. This card provides [Darkness] Energy only while this card is attached to a [Darkness] Pokémon.Whenever the [Darkness] Pokémon this card is attached to is your Active Pokémon and is damaged by an attack from your opponent's Pokémon-EX (even if that Pokémon is Knocked Out), put 2 damage counters on the Attacking Pokémon-EX.(If this card is attached to anything other than a [Darkness] Pokémon, discard this card.)