Most Disturbing ‘Pokémon’
You might as well just call Grimer "The Walking Death". Any time Grimer passes over the grond, its hellish slime leaves the earth incapable of ever again supporting life. Then it sprouts new Grimers to continue the plague. It spends its time in polluted water, feasting on pollution and sewage to survive. And when Grimer evolves into Muk, it gets bigger. It gets more poisonous. It can infect an entire lake with a single drop. It can infect humans too. Imagine the "blob" but extremely poisonous and part of a children's game.