Koga's Ekans is card #77 of 132 in Gym Challenge (2000), a Common illustrated by Ken Sugimori. At about $3.54 it is the #106 most valuable card in the set. In a Gym Challenge booster it turns up about once every 6 packs. It is one of 17 Ekans cards printed so far.
1999Fossil
2000Team Rocket
2002Expedition Base Set
2004Team Rocket Returns
2008Great Encounters
2014XY
2019Hidden Fates
2023151

















See the full Gym Challenge card list
An ungraded Koga's Ekans from Gym Challenge sells for about $3.54. A PSA 10 is worth more, roughly $46.02 by our estimate, and a PSA 9 around $14.16.
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.