Coastal Biome — 1 location on the interactive map.
Abandoned Ship — 1 location on the interactive map.
Sea Route 19, Sea Route 20, Sea Route 21 — 3 locations on the interactive map.
Cherrygrove City, Cianwood City, Cinnabar Island, New Bark Town, Olivine City, Pallet Town, Route 12, Route 13, Route 26, Route 27, Route 32, Route 34 and 8 more — 20 locations on the interactive map.
Tentacool → Tentacruel (Level 30)