This card can only be attached to Pokémon. This card provides every type of Energy, but provides only 2 Energy at a time, only while this card is attached to a Pokémon.
(If this card is attached to anything other than a Pokémon, discard this card.)
This card was included in the Roaring Skies expansion, first released in the Japanese Emerald Break expansion and M Rayquaza-EX Mega Battle Deck. In Japan, it was reprinted as an unnumbered Mirror Holofoil XY-P Promotional card during Battle Festa 2015. Players participating in the CoroCoro Challenge event at each Battle Festa 2015 venue were awarded this card upon recording a single win at the 'Second Stage', which could be reached by recording a win at the 'First Stage' or by earning an 'Advantage Path' from prior Pokémon Card Gym Battle Festa 2015 Pre-Battle events held across Japan between October 1 and 31, 2015. Battle Festa 2015 was held at four locations across Japan: Hiroshima Prefectural Industrial Exhibition Hall, Hiroshima on November 3, 2015; Pacifico Yokohama, Yokohama on November 7, 2015; Intex Osaka, Osaka on November 15, 2015; and Nagoya Trade & Industry Center, Nagoya on November 29, 2015. This print features both the Battle Festa 2015 and CoroCoro Challenge logos.
It was reprinted in Japan as another unnumbered XY-P Promotional card, and was awarded to the top 3 competitors of each CoroCoro Ichiban! Mega Salamence Gym Battle held at participating Pokémon Card Gym venues between August 1 and September 30, 2016. This competition was limited to elementary school students. This print features the Pokémon Card Gym logo and a stamp underneath the effect text that reads "Mega Salamence Gym Battle prize". Double Dragon Energy was later reprinted in the Japanese The Best of XY subset, Ultra Sun & Ultra Moon Deck Build Boxes, and the Extra Regulation Box.