Misty's Horsea is card #87 of 132 in Gym Challenge (2000), a Common illustrated by Ken Sugimori. At about $2.97 it is the #111 most valuable card in the set. In a Gym Challenge booster it turns up about once every 6 packs. It is one of 28 Horsea cards printed so far.
1999Fossil
2000Neo Genesis
2003Aquapolis
2006Holon Phantoms
2010HS—Unleashed
2015Primal Clash
2018Dragon Majesty
2022Lost Origin

















See the full Gym Challenge card list
An ungraded Misty's Horsea from Gym Challenge sells for about $2.97. A PSA 10 is worth more, roughly $38.61 by our estimate, and a PSA 9 around $11.88.
It is a Common, and it shows up about once every 6 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.