Where to catch Grimer

In Paldea (Scarlet & Violet)

• Cortondo — Walk
• East Province (Area Two) — Walk
• West Province (Area Two) — Walk

In Blueberry Academy (Scarlet & Violet – The Indigo Disk)

• Coastal Biome — Walk
• Torchlit Labyrinth — Walk

In Hoenn (Ruby, Sapphire & Emerald)

• Fiery Path — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Celadon City — Surf, Walk
• Route 16 — Surf, Walk
• Route 17 — Surf, Walk
• Route 18 — Surf, Walk

In Kanto (Red, Blue & Yellow)

• Kanto Power Plant — Walk
• Pokémon Mansion — Walk

Grimer — full Pokédex entry