Grimer

Grimer, the Sludge Pokémon, is a Poison-type introduced in Generation I. It evolves into Muk starting at level 38. Grimer's Pokédex entries often describe it as being formed from solidified sludge and pollution, thriving in dirty environments like sewers and industrial areas. Its body is composed of toxic slime, capable of poisoning anything it touches. Grimer's natural habitat is typically urban or industrial, where it can feed on waste and garbage, which contributes to its foul odor. Despite its repulsive nature, Grimer plays a role in the ecosystem by consuming pollution, although its very existence is a byproduct of environmental neglect. In the anime, Ash Ketchum catches a Grimer, which often causes trouble with its stench and playful but messy antics. Its appearance, a purple, amorphous blob with a wide grin and large eyes, makes it instantly recognizable among early Pokémon designs. Grimer embodies the theme of environmental consequences present in the early Pokémon games, serving as a reminder of pollution's impact.