Gyarados-GX, numbered #SM212, is a Holofoil variant from the SM Black Star Promos set, notable for its Promo rarity. As a powerful card in the Pokémon Trading Card Game, it features strong attack capabilities and a distinctive design that appeals to collectors. Currently, it holds a market value of $2.85, reflecting its popularity and utility in gameplay. The card is sought after by both players and collectors alike.