Koga's Grimer is card #78 of 132 in Gym Challenge (2000), a Common illustrated by Ken Sugimori. At about $4.61 it is the #95 most valuable card in the set. In a Gym Challenge booster it turns up about once every 6 packs. It is one of 25 Grimer cards printed so far.
1999Fossil
2000Team Rocket
2002Legendary Collection
2006Legend Maker
2009Platinum
2013Plasma Freeze
2017Sun & Moon
2022Brilliant Stars

















See the full Gym Challenge card list
An ungraded Koga's Grimer from Gym Challenge sells for about $4.61. A PSA 10 is worth more, roughly $59.93 by our estimate, and a PSA 9 around $18.44.
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.