Appears in filthy areas. Thrives by sucking up polluted sludge that is pumped out of factories.
Made of hardened sludge. It smells too putrid to touch. Even weeds won't grow in its path.
As it moves, it loses bits of its body from which new GRIMER emerge. This worsens the stench around it.
Wherever GRIMER has passed, so many germs are left behind that no plants will ever grow again.
When two of these POKéMON's bodies are combined together, new poisons are created.
— Pokédex entries (via PokeAPI)