20 Basic Darkness Energy Pokemon Cards (XY/Black and White Series Design, Unnumbered) [Black, Dark-Type] 20 Darkness energy cards. (Also known as "Dark" energy.) All 20 feature the XY/Black & White series energy design as pictured. These energy cards are English-language, and league/tournament legal. These cards come from pre-constructed decks produced by The Pokemon Company, and are unnumbered.