The Gyarados 4/123 Reverse Holo card from the Heartgold & Soulsilver set is a highly sought-after collectible in the Pokémon TCG world. This Holo Rare card features the powerful Gyarados character with 130 HP and is part of the Stage 1 Pokémon cards manufactured by The Pokémon Company. The English language card is a must-have for any Pokémon card collector looking to add a rare and visually appealing card to their collection.