Misty's Seel is card #91 of 132 in Gym Challenge (2000), a Common illustrated by Ken Sugimori. At about $2.76 it is the #115 most valuable card in the set. In a Gym Challenge booster it turns up about once every 6 packs. It is one of 20 Seel cards printed so far.
1999Base Set
2000Gym Heroes
2002Legendary Collection
2004FireRed & LeafGreen
2007Mysterious Treasures
2009Supreme Victors
2019Unbroken Bonds
2023Crown Zenith

















See the full Gym Challenge card list
An ungraded Misty's Seel from Gym Challenge sells for about $2.76. A PSA 10 is worth more, roughly $35.88 by our estimate, and a PSA 9 around $11.04.
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.