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RGBY Locations

The following table contains every Pokémon and all of its locations.

The following locations allow Fishing: Routes 6, 10, 11, 12, 13, 17, 18, 19, 20, 21, 22, 23, 24, and 25, Pallet Town, Viridian City, Cerulean City, Vermilion City, Vermilion Harbor, Celadon City, Fuchsia City, Cinnabar Island, Safari Zone (all areas), Seafoam Islands (B3F and B4F), and Cerulean Cave (1F and B1F).
Cerulean Gym also allows fishing. Its encounters are the same as Cerulean City's. In Yellow, only the Old and Good Rods work in the Gym.

RBY Locations
Pokémon Games Locations Notes
Bulbasaur
Bulbasaur R B Y Gift: Pallet Town Only one. In Red and Blue, mutually exclusive with Charmander and Squirtle.
R B Y Gift: Cerulean City
Ivysaur
Ivysaur R B Y Evolve Bulbasaur
Venusaur
Venusaur R B Y Evolve Ivysaur
Charmander
Charmander R B Y Gift: Pallet Town Only one. In Red and Blue, mutually exclusive with Bulbasaur and Squirtle.
R B Y Gift: Route 24
Charmeleon
Charmeleon R B Y Evolve Charmander
Charizard
Charizard R B Y Evolve Charmander
Squirtle
Squirtle R B Y Gift: Pallet Town Only one. In Red and Blue, mutually exclusive with Bulbasaur and Charmander.
R B Y Gift: Vermilion City
Wartortle
Wartortle R B Y Evolve Squirtle
Blastoise
Blastoise R B Y Evolve Wartortle
Caterpie
Caterpie R B Y Walking: Route 25, Viridian Forest
R B Y Walking: Routes 2, 24, and 25, Viridian Forest
R B Y Walking: Viridian Forest
Metapod
Metapod R B Y Evolve Caterpie
R B Y Walking: Route 25, Viridian Forest
R B Y Walking: Routes 24 and 25, Viridian Forest
R B Y Walking: Viridian Forest
Butterfree
Butterfree R B Y Evolve Metapod
Weedle
Weedle R B Y Walking: Routes 2, 24, and 25, Viridian Forest
R B Y Walking: Route 25, Viridian Forest
Kakuna
Kakuna R B Y Evolve Caterpie
R B Y Walking: Routes 24 and 25, Viridian Forest
R B Y Walking: Route 25, Viridian Forest
Beedrill
Beedrill R B Y Evolve Kakuna
Pidgey
Pidgey R B Y Walking: Routes 1, 2, 3, 5, 6, 7, 8, 12, 13, 14, 15, 21, 24, and 25
R B Y Walking: Routes 1, 2, 5, 6, 7, 8, 11, 12, 13, 21, 24, and 25, Viridian Forest
Pidgeotto
Pidgeotto R B Y Evolve Pidgey
R B Y Walking: Routes 14, 15, and 21
R B Y Walking: Routes 5, 6, 7, 8, 11, 12, 13, 14, 15, 21, 24, and 25, Viridian Forest
Pidgeot
Pidgeot R B Y Evolve Pidgeotto
Rattata
Rattata R B Y Walking: Routes 1, 2, 4, 9, 16, 21, and 22
R B Y Walking: Routes 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 16, 18, 21, and 22, Pokémon Mansion (1F, 2F, and 3F)
Raticate
Raticate R B Y Evolve Rattata
R B Y Walking: Routes 16, 17, 18, and 21
R B Y Walking: Routes 9, 10, 11, 16, 18, and 21, Pokémon Mansion (all floors)
Spearow
Spearow R B Y Walking: Routes 3, 4, 9, 10, 11, 16, 17, 18, 22, and 23
R B Y Walking: Routes 3, 4, 9, 16, 18, and 22
Fearow
Fearow R B Y Evolve Spearow
R B Y Walking: Routes 17, 18, and 23
R B Y Walking: Routes 9, 16, 17, 18, and 23
Ekans
Ekans R B Y Walking: Routes 4, 8, 9, 10, 11, and 23
Arbok
Arbok R B Y Evolve Ekans
R B Y Walking: Route 23, Cerulean Cave (1F and B1F)
Pikachu
Pikachu R B Y Walking: Viridian Forest, Power Plant In Yellow, you can only receive one Pikachu, and it cannot evolve without being traded.
R B Y Gift: Pallet Town
Raichu
Raichu R B Y Evolve Pikachu
R B Y Walking: Cerulean Cave (1F and B1F)
R B Y Walking: Power Plant, Cerulean Cave (1F and B1F)
Sandshrew
Sandshrew R B Y Walking: Routes 4, 8, 9, 10, 11, and 23
R B Y Walking: Routes 3 and 4, Mt. Moon (1F)
Sandslash
Sandslash R B Y Evolve Sandshrew
R B Y Walking: Route 23, Cerulean Cave (1F and B1F)
R B Y Walking: Cerulean Cave (1F and 2F)
Nidoran♀
Nidoran♀ R B Y Walking: Route 22, Safari Zone (East and West)
In-Game Trade: Route 5-6 Underground Path
The in-game trade in Red and Blue is for your Nidoran♂.
R B Y Walking: Route 22, Safari Zone (all areas)
In-Game Trade: Route 5-6 Underground Path
R B Y Walking: Routes 2, 9, 10, and 22, Safari Zone (all areas)
Nidorina
Nidorina R B Y Evolve Nidoran♀ The in-game trade in Red and Blue is for your Nidorino.
R B Y Walking: Safari Zone (Center and North)
In-Game Trade: Route 11
Purchase: Celadon Game Corner
R B Y Walking: Safari Zone (all areas)
In-Game Trade: Route 11
R B Y Walking: Routes 9 and 23, Safari Zone (East and North)
Nidoqueen
Nidoqueen R B Y Evolve Nidorina
Nidoran♂
Nidoran♂ R B Y Walking: Route 22, Safari Zone (all areas)
R B Y Walking: Route 22, Safari Zone (East and West)
R B Y Walking: Routes 2, 9, 10, and 22, Safari Zone (all areas)
Nidorino
Nidorino R B Y Evolve Nidoran♂
R B Y Walking: Safari Zone (all areas)
R B Y Walking: Safari Zone (Center and North)
Purchase: Celadon Game Corner
R B Y Walking: Routes 9 and 23, Safari Zone (Center and West)
Nidoking
Nidoking R B Y Evolve Nidorino
Clefairy
Clefairy R B Y Walking: Mt. Moon (all floors)
Purchase: Celadon Game Corner
R B Y Walking: Mt. Moon (all floors)
Clefable
Clefable R B Y Evolve Clefairy
Vulpix
Vulpix R B Y Walking: Routes 7 and 8, Pokémon Mansion (all floors)
R B Y Purchase: Celadon Game Corner
Ninetales
Ninetales R B Y Evolve Vulpix
Jigglypuff
Jigglypuff R B Y Walking: Route 3
R B Y Walking: Routes 5, 6, 7, and 8
Wigglytuff
Wigglytuff R B Y Evolve Jigglypuff
R B Y Walking: Cerulean Cave (2F)
R B Y Purchase: Celadon Game Corner
Zubat
Zubat R B Y Walking: Mt. Moon (all floors), Rock Tunnel (all floors), Seafoam Islands (1F), Victory Road (all floors)
R B Y Walking: Mt. Moon (all floors), Rock Tunnel (all floors), Seafoam Islands (all floors), Victory Road (1F and 2F)
Golbat
Golbat R B Y Evolve Zubat
R B Y Walking: Seafoam Islands (1F, B2F, and B4F), Victory Road (all floors), Cerulean Cave (1F)
R B Y Walking: Seafoam Islands (all floors), Victory Road (2F and 3F), Cerulean Cave (all floors)
Oddish
Oddish R B Y Walking: Routes 5, 6, 7, 12, 13, 14, 15, 24, and 25
R B Y Walking: Routes 12, 13, 14, 15, 24, and 25
Gloom
Gloom R B Y Evolve Oddish
R B Y Walking: Routes 12, 13, 14, and 15
R B Y Walking: Routes 12, 13, 14, and 15, Cerulean Cave (1F, 2F)
Vileplume
Vileplume R B Y Evolve Gloom
Paras
Paras R B Y Walking: Mt. Moon (all floors), Safari Zone (East and North)
R B Y Walking: Mt. Moon (B1F, B2F), Safari Zone (Center)
Parasect
Parasect R B Y Evolve Paras The in-game trade in Yellow is for your Tangela.
R B Y Walking: Safari Zone (Center and East), Cerulean Cave (1F and B1F)
R B Y Walking: Safari Zone (Center), Cerulean Cave (1F)
In-Game Trade: Route 18
Venonat
Venonat R B Y Walking: Routes 12, 13, 14, and 15, Safari Zone (Center, West)
R B Y Walking: Routes 14, 15, 24, and 25
Venomoth
Venomoth R B Y Evolve Venonat
R B Y Walking: Safari Zone (North and West), Victory Road (3F), Cerulean Cave (1F and 2F)
R B Y Walking: Routes 14 and 15, Cerulean Cave (1F)
Diglett
Diglett R B Y Walking: Diglett's Cave
Dugtrio
Dugtrio R B Y Evolve Diglett The in-game trade in Yellow is for your Lickitung.
R B Y Walking: Diglett's Cave
R B Y Walking: Diglett's Cave
In-Game Trade: Route 11
Meowth
Meowth R B Y Walking: Routes 5, 6, 7, and 8
Persian
Persian R B Y Evolve Meowth
Psyduck
Psyduck R B Y Walking: Seafoam Islands (1F)
Fishing (Super Rod): Routes 24 and 25, Cerulean City, Safari Zone (all areas)
R B Y Walking: Seafoam Islands (all floors)
Fishing (Super Rod): Routes 24 and 25, Cerulean City, Safari Zone (all areas)
R B Y Surfing: Route 6
Golduck
Golduck R B Y Evolve Psyduck
R B Y Walking: Seafoam Islands (1F)
R B Y Walking: Seafoam Islands (B2F and B4F)
R B Y Surfing: Route 6
Mankey
Mankey R B Y Walking: Routes 5, 6, 7, and 8
R B Y Walking: Routes 3, 4, 22, and 23
Primeape
Primeape R B Y Evolve Mankey
R B Y Walking: Route 23
Growlithe
Growlithe R B Y Walking: Routes 7 and 8, Pokémon Mansion (all floors)
R B Y Walking: Pokémon Mansion (1F)
Arcanine
Arcanine R B Y Evolve Growlithe
Poliwag
Poliwag R B Y Fishing (Good Rod): Any Fishing location
Fishing (Super Rod): Route 22, Pallet Town, Viridian City
R B Y Fishing (Good Rod): Any Fishing location
Fishing (Super Rod): Routes 22 and 23, Viridian City
Poliwhirl
Poliwhirl R B Y Evolve Poliwag
R B Y Fishing (Super Rod): Route 10, Celadon City
R B Y Fishing (Super Rod): Routes 22 and 23
Poliwrath
Poliwrath R B Y Evolve Poliwhirl
Abra
Abra R B Y Walking: Routes 24 and 25
Purchase: Celadon Game Corner
R B Y Walking: Routes 5, 6, 7, and 8
Purchase: Celadon Game Corner
Kadabra
Kadabra R B Y Evolve Abra
R B Y Walking: Cerulean Cave (1F and 2F)
R B Y Walking: Route 8
Alakazam
Alakazam R B Y Evolve Kadabra Kadabra evolves by trading.
Machop
Machop R B Y Walking: Rock Tunnel (all floors), Victory Road (all floors)
R B Y Walking: Route 10, Rock Tunnel (all floors)
Machoke
Machoke R B Y Evolve Machop The in-game trade in Yellow is for your Cubone.
R B Y Walking: Victory Road (all floors)
R B Y Walking: Victory Road (2F and 3F)
In-Game Trade: Route 5-6 Underground Path
Machamp
Machamp R B Y Evolve Machoke Machoke evolves by trading.
In Yellow, the Machoke you receive by in-game trade will evolve into Machamp.
R B Y In-Game Trade: Route 5-6 Underground Path
Bellsprout
Bellsprout R B Y Walking: Routes 5, 6, 7, 12, 13, 14, 15, 24, and 25
R B Y Walking: Routes 12, 13, 14, 15, 24, and 25
Weepinbell
Weepinbell R B Y Evolve Bellsprout
R B Y Walking: Routes 12, 13, 14, and 15
R B Y Walking: Routes 12, 13, 14, and 15, Cerulean Cave (1F and 2F)
Victreebel
Victreebel R B Y Evolve Weepinbell
Tentacool
Tentacool R B Y Surfing: Routes 19, 20, and 21
Fishing (Super Rod): Routes 12, 13, 17, and 18, Pallet Town, Viridian City
R B Y Surfing: Routes 19, 20, and 21, Seafoam Islands (B3F and B4F)
Fishing (Super Rod): Routes 11, 13, 17, 18, 19, 20, and 21, Pallet Town, Vermilion City & Harbor, Cinnabar Island
Tentacruel
Tentacruel R B Y Evolve Tentacool
R B Y Fishing (Super Rod): Routes 19, 20, and 21
Geodude
Geodude R B Y Walking: Mt. Moon (all floors), Rock Tunnel (all floors), Victory Road (all floors)
Graveler
Graveler R B Y Evolve Geodude
R B Y Walking: Victory Road (all floors)
R B Y Walking: Victory Road (all floors), Cerulean Cave (all floors)
Golem
Golem R B Y Evolve Graveler Graveler evolves by trading.
Ponyta
Ponyta R B Y Walking: Pokémon Mansion (all floors)
R B Y Walking: Route 17
Rapidash
Rapidash R B Y Evolve Ponyta
Slowpoke
Slowpoke R B Y Walking: Seafoam Islands (all floors)
Fishing (Super Rod): Route 10, Celadon City, Safari Zone (all areas)
R B Y Walking: Seafoam Islands (1F)
Fishing (Super Rod): Route 10, Celadon City, Safari Zone (all areas)
R B Y Walking: Seafoam Islands (1F, B1F, and B2F)
Fishing (Super Rod): Routes 12 and 13
Slowbro
Slowbro R B Y Evolve Slowpoke
R B Y Walking: Seafoam Islands (B2F and B4F)
Fishing (Super Rod): Route 23, Cerulean Cave (1F and B1F)
R B Y Walking: Seafoam Islands (1F)
Fishing (Super Rod): Route 23, Cerulean Cave (1F and B1F)
R B Y Walking: Seafoam Islands (B2F)
Surfing: Routes 12 and 13
Magnemite
Magnemite R B Y Walking: Power Plant
R B Y Walking: Route 10, Power Plant
Magneton
Magneton R B Y Evolve Magnemite
R B Y Walking: Power Plant, Cerulean Cave (1F)
R B Y Walking: Power Plant
Farfetch'd
Farfetch'd R B Y In-Game Trade: Vermilion City In Red and Blue, you can only get one.
The in-game trade in Red and Blue is for your Spearow.
R B Y Walking: Routes 12 and 13
Doduo
Doduo R B Y Walking: Routes 16, 17, and 18, Safari Zone (East and West)
R B Y Walking: Routes 16, 17, and 18
Dodrio
Dodrio R B Y Evolve Doduo
R B Y Walking: Cerulean Cave (1F, 2F)
R B Y Walking: Route 17
Seel
Seel R B Y Walking: Seafoam Islands (all floors)
In-Game Trade: Cinnabar Lab
The in-game trade in Red and Blue is for your Ponyta.
R B Y Walking: Seafoam Islands (B1F, B2F, B3F, and B4F)
Dewgong
Dewgong R B Y Evolve Seel The in-game trade in Yellow is for your Growlithe.
R B Y Walking: Seafoam Islands (B1F and B3F)
R B Y Walking: Seafoam Islands (B3F and B4F)
In-Game Trade: Cinnabar Lab
Grimer
Grimer R B Y Walking: Pokémon Mansion (all floors)
R B Y Walking: Power Plant, Pokémon Mansion (all floors)
Muk
Muk R B Y Evolve Grimer The in-game trade in Yellow is for your Kangaskhan.
R B Y Walking: Pokémon Mansion (all floors)
R B Y Walking: Power Plant, Pokémon Mansion (2F, 3F, and B1F)
In-Game Trade: Cinnabar Lab
Shellder
Shellder R B Y Walking: Seafoam Islands (all floors)
Fishing (Super Rod): Routes 6, 11, 19, 20, and 21, Vermilion City & Harbor, Cinnabar Island, Seafoam Islands (B3F and B4F)
R B Y Walking: Seafoam Islands (B1F and B2F)
Fishing (Super Rod): Routes 6, 11, 19, 20, and 21, Vermilion City & Harbor, Cinnabar Island, Seafoam Islands (B3F and B4F)
R B Y Fishing (Super Rod): Routes 17 and 18, Vermilion Harbor
Cloyster
Cloyster R B Y Evolve Shellder
Gastly
Gastly R B Y Walking: Pokémon Tower (3F and above)
Haunter
Haunter R B Y Evolve Gastly
R B Y Walking: Pokémon Tower (3F and above)
Gengar
Gengar R B Y Evolve Haunter Haunter evolves by trading.
Onix
Onix R B Y Walking: Rock Tunnel (all floors), Victory Road (all floors)
R B Y Walking: Rock Tunnel (B1F), Victory Road (all floors)
Drowzee
Drowzee R B Y Walking: Route 11
Hypno
Hypno R B Y Evolve Drowzee
R B Y Walking: Cerulean Cave (1F)
Krabby
Krabby R B Y Fishing (Super Rod): Routes 6, 11, 12, 13, 17, 18, 24, and 25, Cerulean City, Vermilion City & Harbor, Fuchsia City, Safari Zone (all areas)
R B Y Walking: Seafoam Islands (all floors)
Fishing (Super Rod): Routes 6, 11, 12, 13, 17, 18, 24, and 25, Cerulean City, Vermilion City & Harbor, Fuchsia City, Safari Zone (all areas)
R B Y Walking: Seafoam Islands (all floors)
Fishing (Super Rod): Routes 10 and 25, Seafoam Islands (B3F and B4F)
Kingler
Kingler R B Y Evolve Krabby
R B Y Fishing (Super Rod): Route 23, Cerulean Cave (1F and B1F)
R B Y Walking: Seafoam Islands (B1F and B3F)
Fishing (Super Rod): Route 23, Cerulean Cave (1F and B1F)
R B Y Walking: Seafoam Islands (B1F, B2F, B3F, and B4F)
Fishing (Super Rod): Routes 10 and 25, Seafoam Islands (B3F and B4F)
Voltorb
Voltorb R B Y Walking: Route 10, Power Plant
R B Y Static: Power Plant (Six)
R B Y Walking: Power Plant
R B Y Static: Power Plant (Six)
Electrode
Electrode R B Y Evolve Voltorb The in-game trade in Red and Blue is for your Raichu.
R B Y Walking: Cerulean Cave (2F and B1F)
Static: Power Plant (Two)
In-Game Trade: Cinnabar Lab
R B Y Static: Power Plant (Two)
Exeggcute
Exeggcute R B Y Walking: Safari Zone (all areas)
Exeggutor
Exeggutor R B Y Evolve Exeggcute
Cubone
Cubone R B Y Walking: Pokémon Tower (3F and above)
R B Y Walking: Pokémon Tower (5F and above), Safari Zone (East, North, and West)
Marowak
Marowak R B Y Evolve Cubone
R B Y Walking: Victory Road (1F and 2F), Cerulean Cave (2F and B1F)
R B Y Walking: Safari Zone (East and West)
Hitmonlee
Hitmonlee R B Y Gift: Saffron City Only one. Mutually exclusive with Hitmonchan.
Hitmonchan
Hitmonchan R B Y Gift: Saffron City Only one. Mutually exclusive with Hitmonlee.
Lickitung
Lickitung R B Y In-Game Trade: Route 18 In Red and Blue, you can only get one.
The in-game trade in Red and Blue is for your Slowbro.
R B Y Walking: Cerulean Cave (B1F)
Koffing
Koffing R B Y Walking: Pokémon Mansion (all floors)
Weezing
Weezing R B Y Evolve Koffing
R B Y Walking: Pokémon Mansion (all floors)
Rhyhorn
Rhyhorn R B Y Walking: Safari Zone (Center and North)
R B Y Walking: Safari Zone (Center and North), Cerulean Cave (2F and B1F)
Rhydon
Rhydon R B Y Evolve Rhyhorn The in-game trade in Yellow is for your Golduck.
R B Y Walking: Cerulean Cave (2F and B1F)
R B Y Walking: Cerulean Cave (2F and B1F)
In-Game Trade: Cinnabar Lab
Chansey
Chansey R B Y Walking: Safari Zone (Center and North), Cerulean Cave (2F and B1F)
R B Y Walking: Safari Zone (Center and East), Cerulean Cave (B1F)
Tangela
Tangela R B Y Walking: Route 21
In-Game Trade: Cinnabar Lab
The in-game trade in Red and Blue is for your Venonat.
R B Y Walking: Safari Zone (Center and West)
Kangaskhan
Kangaskhan R B Y Walking: Safari Zone (East and West)
R B Y Walking: Safari Zone (North)
Horsea
Horsea R B Y Walking: Seafoam Islands (all floors)
Fishing (Super Rod): Routes 19, 20, and 21, Cinnabar Island, Seafoam Islands (B3F and B4F)
R B Y Fishing (Super Rod): Routes 19, 20, and 21, Cinnabar Island, Seafoam Islands (B3F and B4F)
R B Y Fishing (Super Rod): Routes 10, 11, 12, and 13, Vermilion City
Seadra
Seadra R B Y Evolve Horsea
R B Y Walking: Seafoam Islands (B1F and B3F)
Fishing (Super Rod): Route 23, Cerulean Cave (1F and B1F)
R B Y Fishing (Super Rod): Route 23, Cerulean Cave (1F and B1F)
R B Y Fishing (Super Rod): Routes 12 and 13
Goldeen
Goldeen R B Y Fishing (Good Rod): Any Fishing location
Fishing (Super Rod): Routes 12, 13, 17, 18, 19, 20, 21, 22, 24, and 25, Cerulean City, Fuchsia City, Cinnabar Island, Seafoam Islands (B3F and B4F)
R B Y Fishing (Good Rod): Any Fishing location
Fishing (Super Rod): Routes 6 and 24, Cerulean City, Celadon City, Cerulean Cave (1F and B1F)
Seaking
Seaking R B Y Evolve Goldeen
R B Y Fishing (Super Rod): Route 23, Fuchsia City, Cerulean Cave (1F and B1F)
R B Y Fishing (Super Rod): Route 24, Cerulean City, Cerulean Cave (1F and B1F)
Staryu
Staryu R B Y Walking: Seafoam Islands (B1F and B2F)
Fishing (Super Rod): Routes 19, 20, and 21, Cinnabar Island, Seafoam Islands (B3F and B4F)
R B Y Walking: Seafoam Islands (all floors)
Fishing (Super Rod): Routes 19, 20, and 21, Cinnabar Island, Seafoam Islands (B3F and B4F)
R B Y Surfing: Seafoam Islands (B3F and B4F)
Fishing (Super Rod): Routes 19, 20, and 21, Pallet Town, Vermilion Harbor, Cinnabar Island, Seafoam Islands (B3F and B4F)
Starmie
Starmie R B Y Evolve Staryu
Mr. Mime
Mr. Mime R B Y In-Game Trade: Route 2 Only one.
The in-game trade in Red and Blue is for your Abra.
The in-game trade in Yellow is for your Clefairy.
Scyther
Scyther R B Y Walking: Safari Zone (Center and East)
Purchase: Celadon Game Corner
R B Y Walking: Safari Zone (East and North)
Purchase: Celadon Game Corner
Jynx
Jynx R B Y In-Game Trade: Cerulean City In Red and Blue, you can only get one.
The in-game trade in Red and Blue is for your Poliwhirl.
Electabuzz
Electabuzz R B Y Walking: Power Plant
Magmar
Magmar R B Y Walking: Pokémon Mansion (3F and B1F)
Pinsir
Pinsir R B Y Walking: Safari Zone (Center and East)
Purchase: Celadon Game Corner
R B Y Walking: Safari Zone (North and West)
Purchase: Celadon Game Corner
Tauros
Tauros R B Y Walking: Safari Zone (North and West)
R B Y Walking: Safari Zone (East and West)
Magikarp
Magikarp R B Y Fishing (Old Rod): Any Fishing location
Fishing (Super Rod): Routes 12, 13, 17, and 18, Fuchsia City
Purchase: Route 4
R B Y Fishing (Old Rod): Any Fishing location
Fishing (Super Rod): Fuchsia City, Safari Zone (all areas)
Purchase: Route 4
Gyarados
Gyarados R B Y Evolve Magikarp
R B Y Fishing (Super Rod): Fuchsia City
Lapras
Lapras R B Y Gift: Silph Co. Only one.
Ditto
Ditto R B Y Walking: Routes 13, 14, 15, and 23, Cerulean Cave (all floors)
R B Y Walking: Pokémon Mansion (B1F), Cerulean Cave (all floors)
Eevee
Eevee R B Y Gift: Celadon City Only one. Without trading, you can only get one of its evolutions.
Vaporeon
Vaporeon R B Y Evolve Eevee
Jolteon
Jolteon R B Y Evolve Eevee
Flareon
Flareon R B Y Evolve Eevee
Porygon
Porygon R B Y Purchase: Celadon Game Corner
Omanyte
Omanyte R B Y Gift: Cinnabar Lab (Revive from Helix Fossil) Only one. Mutually exclusive with Kabuto.
Omastar
Omastar R B Y Evolve Omanyte
Kabuto
Kabuto R B Y Gift: Cinnabar Lab (Revive from Dome Fossil) Only one. Mutually exclusive with Omanyte.
Kabutops
Kabutops R B Y Evolve Kabuto
Aerodactyl
Aerodactyl R B Y Gift: Cinnabar Lab (Revive from Old Amber) Only one.
Snorlax
Snorlax R B Y Static: Routes 12 and 16 Only two. If defeated or run from, they will not return.
Articuno
Articuno R B Y Static: Seafoam Islands (B4F) Only one. If defeated or run from, it will not return.
Zapdos
Zapdos R B Y Static: Power Plant Only one. If defeated or run from, it will not return.
Moltres
Moltres R B Y Static: Victory Road (2F) Only one. If defeated or run from, it will not return.
Dratini
Dratini R B Y Fishing (Super Rod): Safari Zone (all areas)
Purchase: Celadon Game Corner
R B Y Fishing (Super Rod): Safari Zone (all areas)
Dragonair
Dragonair R B Y Evolve Dratini
R B Y Fishing (Super Rod): Safari Zone (Center)
Dragonite
Dragonite R B Y Evolve Dragonair
Mewtwo
Mewtwo R B Y Static: Cerulean Cave (B1F) Only one. If defeated or run from, it will not return.
Mew
Mew R B Y Programmed in the game, but unobtainable without the use of glitches or hacking.