Fishing for Pokémon
There are three Fishing Rods in the game, but the Old and Good rods aren't worth the time. The Super Rod is available on Route 12 in all versions, so get it and start lashing the lake. :)
Red/Blue Yellow
Psyduck Cerulean, R24, R25, Safari Zone
Poliwag Pallet, Viridian, R10, R22 Viridian, R23
Poliwhirl Celadon R22, R23
Shellder R6, Vermillion, Anne, R11, R19, R20, Seafoam, Cinnibar, R21 Anne, R16, R17, R18
Krabby Cerulean, R24, R25, R6, Vermillion, Anne, R11, R12, R13, R14, R15, Fuchsia, Safari Zone, R16, R17, R18 R25, R10, Seafoam
Kingler R23, Cerulean Cave R25, R10, Seafoam
Horsea R19, R20, Seafoam, Cinnibar, R21 Vermillion, R11, R10, R12, R13, R14, R15
Seadra R12, R13, R14, R15, R23, Cerulean Cave
Goldeen Cerulean, R24, R25, R12, R13, R14, R15, Fuchsia, R16, R17, R18, R19, R20, Seafoam, Cinnibar, R21, R22 Cerulean, R24, R6, Celadon, Cerulean Cave
Seaking Fuchsia, R23, Cerulean Cave Cerulean, R24, Cerulean Cave
Staryu R19, R20, Seafoam, Cinnibar, R21 Pallet, Anne, R19, R20, Seafoam, Cinnibar, R21
Magikarp R12, R13, R14, R15, Fuchsia, R16, R17, R18 Fuchsia, Safari Zone
Gyarados Fuchsia
Tentacool Pallet, Viridian, R12, R13, R14, R15, R16, R17, R18 Pallet, Vermillion, Anne, R11, R13, R14, R15, R16, R17, R18, R19, R20, Cinnibar, R21
Tentacruel R19, R20, R21
Slowpoke R10, Celadon, Safari Zone
Slowbro R23, Cerulean Cave
Dratini Safari Zone Safari Zone
Dragonair Safari Zone (Entrance only)