Well, Here is a List of all the Pokémon Catchable in both Fire Red and Leaf Green

No. New Picture US. Name
#001
Bulbasaur
#002
Ivysaur
#003
Venusaur
#004
Charmander
#005
Charmeleon
#006
Charizard
#007
Squirtle
#008
Wartortle
#009
Blastoise
#010
Caterpie
#011
Metapod
#012
Butterfree
#013
Weedle
#014
Kakuna
#015
Beedrill
#016
Pidgey
#017
Pidgeotto
#018
Pidgeot
#019
Rattata
#020
Raticate
#021
Spearow
#022
Fearow
#023
Ekans
#024
Arbok
#025
Pikachu
#026
Raichu
#027
Sandshrew
#028
Sandslash
#029
Nidoran
#030
Nidorina
#031
Nidoqueen
#032
Nidoran
#033
Nidorino
#034
Nidoking
#035
Clefairy
#036
Clefable
#037
Vulpix
#038
Ninetales
#039
Jigglypuff
#040
Wigglytuff
#041
Zubat
#042
Golbat
#043
Oddish
#044
Gloom
#045
Vileplume
#046
Paras
#047
Parasect
#048
Venonat
#049
Venomoth
#050
Diglett
#051
Dugtrio
#052
Meowth
#053
Persian
#054
Psyduck
#055
Golduck
#056
Mankey
#057
Primeape
#058
Growlithe
#059
Arcanine
#060
Poliwag
#061
Poliwhirl
#062
Poliwrath
#063
Abra
#064
Kadabra
#065
Alakazam
#066
Machop
#067
Machoke
#068
Machamp
#069
Bellsprout
#070
Weepinbell
#071
Victreebel
#072
Tentacool
#073
Tentacruel
#074
Geodude
#075
Graveler
#076
Golem
#077
Ponyta
#078
Rapidash
#079
Slowpoke
#080
Slowbro
#081
Magnemite
#082
Magneton
#083
Farfetch'd
#084
Doduo
#085
Dodrio
#086
Seel
#087
Dewgong
#088
Grimer
#089
Muk
#090
Shellder
#091
Cloyster
#092
Gastly
#093
Haunter
#094
Gengar
#095
Onix
#096
Drowzee
#097
Hypno
#098
Krabby
#099
Kingler
#100
Voltorb
#101
Electrode
#102
Exeggcute
#103
Exeggutor
#104
Cubone
#105
Marowak
#106
Hitmonlee
#107
Hitmonchan
#108
Lickitung
#109
Koffing
#110
Weezing
#111
Rhyhorn
#112
Rhydon
#113
Chansey
#114
Tangela
#115
Kangaskahn
#116
Horsea
#117
Seadra
#118
Goldeen
#119
Seaking
#120
Staryu
#121
Starmie
#122
Mr. Mime
#123
Scyther
#124
Jynx
#125
Electabuzz
#126
Magmar
#127
Pinsir
#128
Tauros
#129
Magikarp
#130
Gyarados
#131
Lapras
#132
Ditto
#133
Eevee
#134
Vaporeon
#135
Jolteon
#136
Flareon
#137
Porygon
#138
Omanyte
#139
Omastar
#140
Kabuto
#141
Kabutops
#142
Aerodactyl
#143
Snorlax
#144
Articuno
#145
Zapdos
#146
Moltres
#147
Dratini
#148
Dragonair
#149
Dragonite
#150
Mewtwo
#151
Mew
#161
Sentret
#162
Furret
#165
Ledyba
#166
Ledian
#167
Spinarak
#168
Ariados
#169
Crobat
#172
Pichu
#173
Cleffa
#174
Igglybuff
#175
Togepi
#176
Togetic
#177
Natu
#178
Xatu
#182
Bellossom
#183
Marill
#184
Azumarill
#186
Politoed
#187
Hoppip
#188
Skiploom
#189
Jumpluff
#193
Yanma
#194
Wooper
#195
Quagsire
#196
Espeon
#197
Umbreon
#198
Murkrow
#199
Slowking
#200
Misdreavus
#201
Unown
#202
Wobbuffet
#206
Dunsparce
#208
Steelix
#211
Qwilfish
#212
Scizor
#214
Heracross
#215
Sneasel
#218
Slugma
#219
Magcargo
#220
Swinub
#221
Piloswine
#223
Remoraid
#224
Octillery
#225
Delibird
#226
Mantine
#227
Skarmory
#230
Kingdra
#231
Phanpy
#232
Donphan
#233
Porygon2
#236
Tyrogue
#237
Hitmontop
#238
Smoochum
#239
Elekid
#240
Magby
#242
Blissey
#243
Raikou
#244
Entei
#245
Suicune
#246
Larvitar
#247
Pupitar
#248
Tyranitar
#249
Lugia
#250
Ho-oh
#298
Azurill
#360
Wynaut
#386
Deoxys

 
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