Gyarados is card #123 of 123 in HeartGold & SoulSilver (2010), a Rare Holo illustrated by Wataru Kawahara. At about $370 it is the #2 most valuable card in the set. In a HeartGold & SoulSilver booster it turns up about once every 47 packs. It is one of 57 Gyarados cards printed so far.
1999Base Set
2002Legendary Collection
2006Holon Phantoms
2009Platinum
2010HeartGold & SoulSilver
2013Legendary Treasures
2017Crimson Invasion
2021Evolving Skies

















See the full HeartGold & SoulSilver card list
An ungraded Gyarados from HeartGold & SoulSilver sells for about $370. A PSA 10 is worth more, roughly $2,957 by our estimate, and a PSA 9 around $1,035.
It is a Rare Holo, and it shows up about once every 47 HeartGold & SoulSilver packs.
Wataru Kawahara drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open HeartGold & SoulSilver booster packs in your browser with the set's real pull rates and keep what you pull in a digital binder. No real cards, nothing to buy.