Not all the locations were listed if a Pokemon could be found in multiple locations (ex: Pidgey, Rattata).

Number	Name	Locations
001	Bulbasaur	Receive from Professor Oak in Pallet Town
002	Ivysaur	Evolve Bulbasaur
003	Venusaur	Evolve Ivysaur
004	Charmander	Receive from Professor Oak in Pallet Town
005	Charmeleon	Evolve Charmander
006	Charizard	Evolve Charmeleon
007	Squirtle	Receive from Professor Oak in Pallet Town
008	Wartortle	Evolve Squirtle
009	Blastoise	Evolve Wartortle
010	Caterpie	Viridian Forest
011	Metapod	Viridian Forest
012	Butterfree	Evolve Metapod
013	Weedle	Viridian Forest
014	Kakuna	Viridian Forest
015	Beedrill	Evolve Kakuna
016	Pidgey	Almost everywhere
017	Pidgeotto	Evolve Pidgey
018	Pidgeot	Evolve Pidgeotto
019	Rattata	Almost everywhere
020	Raticate	Evolve Rattata
021	Spearow	Almost everywhere
022	Fearow	Route 23
023	Ekans	Red Only: Route 4, Route 11, Route 23
024	Arbok	Red Only: Cerulean Cave
025	Pikachu	Viridian Forest, Power Plant
026	Raichu	Cerulean Cave
027	Sandshrew	Blue Only: Route 4, Route 11, Route 23
028	Sandslash	Cerulean Cave
029	Nidoran F	Safari Zone, Route 22
030	Nidorina	Safari Zone
031	Nidoqueen	Evolve Nidorina
032	Nidoran M	Safari Zone, Route 22
033	Nidorino	Safari Zone
034	Nidoking	Evolve Nidorino
035	Clefairy	Mount Moon
036	Clefable	Evolve Clefairy
037	Vulpix	Blue Only: Routes 7-8, Pokemon Mansion
038	Ninetails	Evolve Vulpix
039	Jigglypuff	Route 3
040	Wigglytuff	Cerulean Cave
041	Zubat	Almost all caves
042	Golbat	Almost all caves
043	Oddish	Red Only: Route 5, Routes 24-25
044	Gloom	Red Only: Routes 12-15
045	Vileplume	Evolve Gloom
046	Paras	Mount Moon
047	Parascet	Safari Zone, Cerulean Cave
048	Venonat	Safari Zone
049	Venomoth	Safari Zone, Cerulean Cave
050	Diglett	Diglett's Cave
051	Dugtrio	Diglett's Cave
052	Meowth	Blue Only: Routes 5-8
053	Persian	Evolve Meowth
054	Psyduck	Seafoam Island, Safari Zone
055	Golduck	Seafoam Island
056	Mankey	Red Only: Routes 5-8
057	Primape	Route 23
058	Growlithe	Red Only: Route 7, Route 8, Pokemon Mansion
059	Arcanine	Evolve Growlithe
060	Poliwag	Fish in cities
061	Poliwhirl	Evolve Poliwag
062	Poliwrath	Evolve Poliwhirl
063	Abra	Routes 24-25
064	Kadabra	Route 8
065	Alakazam	Evolve Kadabra
066	Machop	Rock Tunnel, Victory Road
067	Machoke	Evolve Machop
068	Machamp	Evolve Machoke
069	Bellsprout	Blue Only: Route 5, Routes 24-25
070	Weepinbell	Blue Only: Routes 12-15
071	Victreebel	Evolve Weepinbell
072	Tentacool	Wherever there is water
073	Tentacruel	Evolve Tentacool
074	Geodude	Almost all caves
075	Graveler	Evolve Geodude
076	Golem	Evolve Golem
077	Ponyta	Pokemon Mansion
078	Rapidash	Evolve Ponyta
079	Slowpoke	Seafoam Islands
080	Slowbro	Evolve Slowpoke
081	Magnemite	Abandoned Power Plant
082	Magneton	Abandoned Power Plant
083	Farfetch'd	Trade for Spearow in Vermilion
084	Doduo	Safari Zone
085	Dotrio	Cerulean Cave
086	Seel	Seafoam Islands
087	Dewgong	Evolve Seel
088	Grimer	Pokemon Mansion
089	Muk	Pokemon Mansion
090	Shellder	Route 6, Route 11, Route 19, Route 21
091	Cloyster	Evolve Cloyster
092	Ghastly	Pokemon Tower
093	Haunter	Pokemon Tower
094	Gengar	Evolve Haunter
095	Onix	Rock Tunnel, Victory Road
096	Drowsee	Route 11
097	Hypno	Cerulean Cave
098	Krabby	Seafoam Islands
099	Kingler	Evolve Krabby
100	Voltorb	Abandoned Power Plant
101	Electrode	Abandoned Power Plant
102	Exeggcute	Safari Zone
103	Exeggutor	Evolve Exeggccute
104	Cubone	Pokemon Tower
105	Marowak	Victory Road
106	Hitmonlee	Fighting Dojo in Saffron City
107	Hitmonchan	Fighting Dojo in Saffron City
108	Lickitung	Trade for Slowbro in Route 18
109	Koffing	Pokemon Mansion
110	Weezing	Pokemon Mansion
111	Rhyhorn	Safari Zone
112	Rhydon	Cerulean Cave
113	Chansey	Safari Zone, Cerulean Cave
114	Tangela	Route 21
115	Kangaskhan	Safari Zone
116	Horsea	Fish in Sea Routes
117	Seadra	Route 23 (Fish)
118	Goldeen	Fish anywhere
119	Seaking	Evolve Goldeen
120	Staryu	Seafoam Islands
121	Starmie	Evolve Starmie
122	Mr. Mime	Trade for Abra in Rotue 2
123	Scyther	Red Only: Safari Zone
124	Jynx	Trade for Poliwhirl in Cerulean City
125	Electabuzz	Red Only: Abandoned Power Plant
126	Magmar	Blue Only: Pokemon Mansion
127	Pinser	Blue Only: Safari Zone
128	Tauros	Safari Zone
129	Magikarp	Fish anywhere
130	Gyarados	Evolve Magikarp
131	Ditto	Cerulean Cave
132	Lapras	Sliph Co
133	Eevee	Top of Celadon Mansion
134	Vaporeon	Evolve Eevee
135	Jolteon	Evolve Eevee
136	Flareon	Evolve Eevee
137	Porygon	Celadon Game Corner
138	Omanyte	Choose Helix Fossil in Mount Moon and revive in Cinnabar
139	Omastar	Evolve Omanyte
140	Kabuto	Choose Dome Fossil in Mount Moon and revive in Cinnabar
141	Kabutops	Evolve Kabuto
142	Aerodactyl	Receive Old Amber in Pewter and revive in Cinnabar
143	Snorlax	Route 16 and Route 12
144	Articuno	Seafoam Islands
145	Zapdos	Abandoned Power Plant
146	Moltres	Victory Road
147	Dratini	Fish in Safari Zone
148	Dragonair	Evolve Dratini
149	Dragonite	Evolve Dragonair
150	Mewtwo	Cerulean Cave
151	Mew	Mew Glitch