Misty's Gyarados is card #13 of 132 in Gym Challenge (2000), a Rare Holo illustrated by Ken Sugimori. At about $425 it is the #5 most valuable card in the set. In a Gym Challenge booster it turns up about once every 59 packs. It is one of 57 Gyarados cards printed so far.
1999Base Set
2000Gym Challenge
2002Legendary Collection
2006Holon Phantoms
2009Platinum
2013Legendary Treasures
2017Crimson Invasion
2021Evolving Skies

















See the full Gym Challenge card list
An ungraded Misty's Gyarados from Gym Challenge sells for about $425. A PSA 10 is worth more, roughly $5,525 by our estimate, and a PSA 9 around $1,700.
It is a Rare Holo, and it shows up about once every 59 Gym Challenge packs.
Ken Sugimori drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Gym Challenge 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.