If the Pokemon 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 Pokemon Darkness Energy is attached to, unless it's D or has Dark in its name. Darkness Energy provides D Energy. (Doesn't count as a basic Energy card.)
Near Mint - $4.70
Near Mint Reverse Holofoil - $13.10
Lightly Played - $4.45
Lightly Played Reverse Holofoil - $12.45
Moderately Played - $4.00
Moderately Played Reverse Holofoil - $11.15
Heavily Played - $3.50
Heavily Played Reverse Holofoil - $9.80
Damaged - $3.30
Damaged Reverse Holofoil - $9.15