Coastal Biome — 1 location on the interactive map.
Abandoned Ship, Dewford Town, Ever Grande City, Lilycove City, Mossdeep City, Pacifidlog Town, Route 103, Route 105, Route 106, Route 107, Route 108, Route 109 and 22 more — 34 locations on the interactive map.
Cinnabar Island, Pallet Town, Route 11, Route 12, Route 13, Route 17, Route 18, Sea Route 19, Sea Route 20, Sea Route 21, Seafoam Islands, Vermilion City and 1 more — 13 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)