Gym Challenge·#78·2000
Grimer, the Sludge Pokémon, is a Generation I Poison-type creature that evolves into Muk, known for its toxic nature and distinct role in the Pokémon world. This specific Koga’s Grimer card from the 2000 Gym Challenge set is a 1st Edition common, standing out due to its unique Gym Leader affiliation and early print run. Here, visitors will find detailed Pokédex lore for Grimer, a breakdown of this card's attacks, energy costs, weakness, and its edition history.
Read more ↓Grimer, the Sludge Pokémon, is a Generation I Poison-type creature known for its putrid odor and affinity for polluted environments. It evolves into Muk starting at level 38. Grimer's body is composed entirely of sludge, which it absorbs from its surroundings, growing larger and more toxic. Often found in dirty canals, factories, and urban areas, Grimer thrives on waste and pollution, making it a symbol of environmental degradation in the Pokémon world. In the games, it is typically encountered in areas with high levels of human activity and waste. Grimer and Muk have played roles in the anime, often as nuisances or as Pokémon owned by antagonists like Team Rocket, but also as companions to characters like Ash, who famously owned a Muk. Its unique physiology and connection to pollution give it a distinct place in the Pokémon ecosystem and lore.
Last updated: April 10, 2026
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