Cortondo, East Province (Area Two), West Province (Area Two) — 3 locations on the interactive map.
Coastal Biome, Torchlit Labyrinth — 2 locations on the interactive map.
Fiery Path — 1 location on the interactive map.
Kanto Power Plant, Pokémon Mansion — 2 locations on the interactive map.
Celadon City, Route 16, Route 17, Route 18 — 4 locations on the interactive map.
Grimer → Muk (Level 38)