Pokemon TCG: Dragon Majesty Premium Powers Collection - Rules of Play says:

Strong, swift, and utterly amazing, draconic Pokémon have been part of the Pokémon TCG from the earliest days—and now they’re stronger than ever! Featuring two beautiful Rainbow foil Pokémon-GX promo cards, plus an oversize Rainbow foil version of Dragonite-GX, this set will send your collection soaring to new heights on dragon wings! In this Dragon Majesty Premium Powers Collection, you’ll find an astonishing array of draconic treasures.