| # | Pokémon | Element | Location |
| A | |||
| 63 | Abra | Psychic | Goldenrod Game Corner, Route 5, 6, 8, 24 |
| 142 | Aerodactyl | Rock/Flying | Girl on Route 14 trades it for your Chansey |
| 190 | Aipom | Normal | In trees on Route 29 and 44 |
| 65 | Alakazam | Psychic | Evolves from Kadabra by trade |
| 181 | Ampharos | Electric | Evolves from Flaafy at Lv30 |
| 24 | Arbok | Poison | Evolves from Ekans at Lv22, Route 4 |
| 59 | Arcanine | Fire | Evolves from Growlithe with use of a Fire Stone |
| 168 | Ariados | Bug/Poison | Evolves from Spinarak at Lv22, Route 2 at night |
| 144 | Articuno | Ice/Flying | R/B/Y |
| 184 | Azumarill | Water | Evolves from Marill at Lv18 |
| B | |||
| 153 | Bayleef | Grass | Evolves from Chicorita at Lv16 |
| 15 | Beedrill | Bug/Poison | Evolves from Kakuna at Lv10, National Park, Silver: Illex Forest in trees at night |
| 182 | Bellossom | Grass | Evolves from Gloom with the use of a Sun Stone |
| 69 | Bellsprout | Grass/Poison | Route 5, 6, 24, 25, 31, 32, 44 |
| 9 | Blastoise | Water | Evolves from Wartortle at Lv36 |
| 242 | Blissey | Normal | Evolves from Chansey when happy |
| 1 | Bulbasaur | Grass/Poison | R/B/Y |
| 12 | Butterfree | Bug/Flying | Evolves from Metapod at Lv10, National Park, Gold: Illex Forest in trees at night |
| C | |||
| 10 | Caterpie | Bug | National Park, Gold: Route 2, 30, 31, Illex Forest |
| 251 | Celebi | Grass/Psychic | Nintendo Download Events, Gameshark |
| 113 | Chansey | Normal | Route 14 |
| 6 | Charizard | Fire/Flying | Evolves from Charmeleon at Lv36 |
| 4 | Charmander | Fire | R/B/Y |
| 5 | Charmeleon | Fire | Evolves from Charmander at Lv16 |
| 152 | Chicorita | Grass | One of the starting Pokémon in Professor Elm's lab |
| 170 | Chinchou | Water/Electric | Fish from the Olivine City dock |
| 36 | Clefable | Normal | Evolves from Clefairy with use of a Moon Stone |
| 35 | Clefairy | Normal | Mt. Moon at night |
| 173 | Cleffa | Normal | Breed from two Clefairy or Clefable |
| 91 | Cloyster | Water/Ice | Evolves from Shellder with use of a Water Stone |
| 222 | Corsola | Water/Rock | Cianwood, Misty's Gym fish with Super Rod |
| 169 | Crobat | Poison/Flying | Evolves from Golbat when happy |
| 159 | Croconaw | Water | Evolves from Totodile at Lv18 |
| 104 | Cubone | Ground | Rock Tunnel |
| 155 | Cyndaquil | Fire | One of the starting Pokémon in Professor Elm's lab |
| D | |||
| 225 | Delibird | Ice/Flying | Ice Path |
| 87 | Dewgong | Water/Ice | Evolves from Seel at Lv34 |
| 50 | Diglett | Ground | Diglett's Cave |
| 132 | Ditto | Normal | Route 34 |
| 85 | Dodrio | Normal/Flying | Evolves from Doduo at Lv31, tall grass by Mt Silver |
| 84 | Doduo | Normal/Flying | Route 26, 27, tall grass by Mt Silver |
| 232 | Donphan | Ground | Evolves from Phanpy at Lv25, Victory Road, Mt. Silver |
| 148 | Dragonair | Dragon | Evolves from Dratini at Lv30, Dragon Cave |
| 149 | Dragonite | Dragon | Evolves from Dragonair at Lv55 |
| 147 | Dratini | Dragon | Dragon Cave |
| 96 | Drowzee | Psychic | Route 11, 34, 35 |
| 51 | Dugtrio | Ground | Evolves from Diglett at Lv26, Diglett's Cave |
| 206 | Dunsparce | Normal | Dark Cave |
| E | |||
| 133 | Eevee | Normal | Bill's house in Goldenrod City, Celadon Game Corner |
| 23 | Ekans | Poison | Gold: Goldenrod City Game Corner, Silver: Route 4, 32 |
| 125 | Electabuzz | Electric | Evolves from Elekid at Lv30, Power Plant |
| 101 | Electrode | Electric | Evolves from Voltorb at Lv30 |
| 239 | Elekid | Electric | Breed from two Electabuzz |
| 244 | Entei | Fire | After set free in the Burned Tower, it can be found anywhere in Johto |
| 196 | Espeon | Psychic | Evolves from Eevee when happy, at day |
| 102 | Exeggcute | Grass/Psychic | Illex Forest in trees at night |
| 103 | Exeggutor | Grass/Psychic | Evolves from Exeggcute with use of a Leaf Stone |
| F | |||
| 83 | Farfetche'd | Normal/Flying | Route 38 |
| 22 | Fearow | Normal/Flying | Evolves from Fearow at Lv20, Route 10 |
| 160 | Feraligatr | Water | Evolves from Croconaw at Lv30 |
| 180 | Flaafy | Electric | Evolves from Mareep at Lv15, Route 42, 43 |
| 136 | Flareon | Fire | Evolves from Eevee with use of a Fire Stone |
| 205 | Forretress | Bug/Steel | Evolves from Pineco at Lv31 |
| 162 | Furret | Normal | Evolves from Sentret at Lv15, Route 1 |
| G | |||
| 92 | Gastly | Ghost/Poison | Bellsprout Tower at night, Tin Tower |
| 94 | Gengar | Ghost/Poison | Evolves from Haunter when traded |
| 74 | Geodude | Rock/Ground | Mt. Mortar, Dark Cave, Mt. Moon, Rock Tunnel, Route 45, 46 |
| 203 | Girafarig | Normal/Psychic | Route 43 |
| 207 | Gligar | Ground/Flying | Gold: Route 45/46 |
| 44 | Gloom | Grass/Poison | Evolves from Oddish at Lv21, Route 5 |
| 42 | Golbat | Poison/Flying | Evolves from Zubat at Lv22, Whirl Islands, Mt. Mortar, Mt. Silver, Ice Path, Victory Road, Route 26, 27 |
| 118 | Goldeen | Water | Mt. Mortar, Route 9, 10, 26, 27, 42 |
| 55 | Golduck | Water | Evolves from Psyduck at Lv33, Mt. Silver, Route 6 |
| 76 | Golem | Rock/Ground | Evolves from Geodude when traded |
| 210 | Granbull | Normal | Evolves from Snubbull at Lv23 |
| 75 | Graveler | Rock/Ground | Evolves from Geodude at Lv25, Mt. Silver, Mt. Mortar, Dark Cave, Victory Road, Route 45, 46 |
| 88 | Grimer | Poison | Celadon City, Route 16, 17, 18 |
| 58 | Growlithe | Fire | Gold: Route 7, 8, 36, 37 |
| 130 | Gyarados | Water/Flying | Evolves from Magikarp at Lv20, Lake of Rage (Red and Normal) |
| H | |||
| 93 | Haunter | Ghost/Poison | Evolves from Gastly at Lv25 |
| 214 | Heracross | Bug/Fighting | Route 29, 44 in trees |
| 107 | Hitmonchan | Fighting | Evolves from Tyrogue at Lv20 if its defence is higher than its attack |
| 106 | Hitmonlee | Fighting | Evolves from Tyrogue at Lv20 if its attack is higher than its defence |
| 237 | Hitmontop | Fighting | Evolves from Tyrogue at Lv20 if its attack is the same as its defence |
| 250 | Ho-oh | Fire/Flying | Roof of Tin Tower |
| 163 | Hoothoot | Normal/Flying | National Park, Route 29, 31, 35, 36, 37 |
| 187 | Hoppip | Grass/Flying | Route 13, 14, 15, 32 |
| 116 | Horsea | Water | Whirl Islands |
| 229 | Houndoom | DarkFire | Evolves from Houndour at Lv24 |
| 228 | Houndour | Dark/Fire | Route 7 at night |
| 97 | Hypno | Psychic | Evolves from Drowzee at Lv26 |
| I | |||
| 174 | Igglybuff | Normal | Breed from two Jigglypuff or Wigglytuff |
| 2 | Ivysaur | Grass/Poison | Evolves from Bulbasaur at Lv16 |
| J | |||
| 39 | Jigglypuff | Normal | Route 4 |
| 135 | Jolteon | Electric | Evolves from Eevee with use of a Thunder Stone |
| 189 | Jumpluff | Grass/Flying | Evolves from Skiploom at Lv27 |
| 124 | Jynx | Ice/Psychic | Evolves from Smoochum at Lv30, Ice Path |
| K | |||
| 140 | Kabuto | Rock/Water | R/B/Y |
| 141 | Kabutops | Rock/Water | Evolves from Kabuto at Lv40 |
| 64 | Kadabra | Psychic | Evolves from Abra at Lv16, Route 17 |
| 14 | Kakuna | Bug/Poison | Evolves from Weedle at Lv7, National Park, Silver: Illex Forest, Route 30, 31 |
| 115 | Kangaskhan | Normal | Rock Tunnel |
| 230 | Kingdra | Water/Dragon | Evolves from Seadra when traded and holding a Dragon Scale |
| 99 | Kingler | Water | Evolves from Krabby at Lv28 |
| 109 | Koffing | Poison | Burnt Tower |
| 98 | Krabby | Water | Dark Cave, Whirl Islands, Cianwood (break the rocks), Olivine (fishing) |
| L | |||
| 171 | Lanturn | Water/Electric | Evolves from Chinchou at Lv27 |
| 131 | Lapras | Water/Ice | Union Cave (Fridays) |
| 246 | Larvitar | Rock/Ground | Mt. Silver |
| 166 | Ledian | Bug/Flying | Evolves from Ledyba at Lv18, Silver: Route 2 in the morning |
| 165 | Ledyba | Bug/Flying | Silver: 2, 31 in the morning |
| 108 | Lickitung | Normal | Route 44 |
| 249 | Lugia | Psychic/Flying | Whirl Islands |
| M | |||
| 68 | Machamp | Fighting | Evolves from Machoke when traded |
| 67 | Machoke | Fighting | Evolves from Machop at Lv28, Mt. Mortar, Rock Tunnel |
| 66 | Machop | Fighting | Goldenrod (trade), Mt. Mortar, Rock Tunnel |
| 240 | Magby | Fire | Breed from two Magmar |
| 219 | Magcargo | Fire/Rock | Evolves from Slugma at Lv38 |
| 129 | Magikarp | Water | Fish anywhere with an Old Rod, Dragon Den, Lake of Rage |
| 126 | Magmar | Fire | Evolves from Magby at Lv30, Burnt Tower |
| 81 | Magnemite | Electric/Steel | Route 6, 11 |
| 82 | Magenton | Electric/Steel | Evolves from Magnemite at Lv30 |
| 56 | Mankey | Fighting | Route 9, 42 |
| 226 | Mantine | Water/Flying | Gold: Route 41 |
| 179 | Mareep | Electric | Route 32, 42 |
| 183 | Marill | Water | Mt. Mortar (in swarms) |
| 105 | Marowak | Ground | Evolves from Cubone at Lv28, Rock Tunnel |
| 154 | Meganium | Grass | Evolves from Bayleef at Lv32 |
| 52 | Meowth | Normal | Silver: Route 5, 6, 38 |
| 11 | Metapod | Bug | Evolves from Caterpie at Lv7, National Park, Gold: Illex Forest, Route 2, 30, 31 |
| 151 | Mew | Psychic | Nintendo Download Events, Gameshark |
| 150 | Mewtwo | Psychic | R/B/Y |
| 241 | Miltank | Normal | Route 38 |
| 200 | Misdreavus | Ghost | Mt. Silver at night |
| 146 | Moltres | Fire | R/B/Y |
| 122 | Mr Mime | Psychic | Route 21 |
| 89 | Muk | Poison | Evolves from Grimer at Lv38, Celadon City, Route 16, 17, 18, |
| 198 | Murkrow | Dark/Flying | Route 7 at night |
| N | |||
| 177 | Natu | Psychic/Flying | Outside the Ruins of Alph |
| 34 | Nidoking | Poison/Ground | Evolves from Nidorino with use of a Moon Stone |
| 31 | Nidoqueen | Poison/Ground | Evolves from Nidorina with use of a Moon Stone |
| 29 | Nidoran(f) | Poison | Route 35 |
| 32 | Nidoran(m) | Poison | Route 35 |
| 30 | Nidorina | Poison | Evolves from Nidoran(f) at Lv16, Route 13, 14, 15 |
| 33 | Nidorino | Poison | Evolves from Nidoran(m) at Lv16, Route 13, 14, 15 |
| 38 | Ninetales | Fire | Evolves from Vulpix with use of a Fire Stone |
| 164 | Noctowl | Normal/Flying | Evolves from Hoothoot at Lv20, Route 2, 8, 13, 14, 15, 43 |
| O | |||
| 224 | Octillery | Water | Evolves from Remoraid at Lv25 |
| 43 | Oddish | Grass/Poison | Illex Forest at night, Route 24, 25 |
| 138 | Omanyte | Rock/Water | R/B/Y |
| 139 | Omastar | Rock/Water | Evolves from Omanyte at Lv40 |
| 95 | Onix | Rock/Ground | Violet City (trade), Victory Road, Rock Tunnel, Mt. Silver |
| P | |||
| 46 | Paras | Bug/Grass | Illex Forest, National Park, Mt. Moon |
| 47 | Parasect | Bug/Grass | Evolves from Paras at Lv24 |
| 53 | Persian | Normal | Evolves from Meowth at Lv28, Route 8 |
| 231 | Phanpy | Ground | Route 45, 46 |
| 172 | Pichu | Electric | Breed from two Pikachu or Raichu |
| 18 | Pidgeot | Normal/Flying | Evolves from Pidgeotto at Lv36 |
| 17 | Pidgeotto | Normal/Flying | Evolves from Pidgey at Lv18, Route 2, 8, 13, 24, 25 |
| 16 | Pidgey | Normal/Flying | National Park, Route 1, 2, 5, 6, 24, 25, 29, 30, 35, 36 |
| 25 | Pikachu | Electric | Route 2 |
| 221 | Piloswine | Ice/Ground | Evolves from Swinub at Lv38 |
| 204 | Pineco | Bug | Illex Forest, Route 43 in trees |
| 127 | Pinsir | Bug | National Park |
| 186 | Politoed | Water | Evolves from Poliwhirl when traded holding a King Stone |
| 60 | Poliwag | Water | Mt. Silver, Ruins of Alph in water, Route 30, 31, 44 |
| 61 | Poliwhirl | Water | Evolves from Poliwag at Lv25, Mt Silver in water, Route 30, 31 |
| 62 | Poliwrath | Water/Fighting | Evolves from Poliwhirl with use of a Water Stone |
| 77 | Ponyta | Fire | Route 26, 27, Mt. Silver |
| 137 | Porygon | Normal | Celadon City Game Corner for 9999 coins |
| 233 | Porygon 2 | Normal | Evolves from Porygon when traded holding the item Upgrade |
| 57 | Primeape | Fighting | Evolves from Mankey at Lv28, Route 9, 42 |
| 54 | Psyduck | Water | Illex Forest in water, Route 6, 34, 35 |
| 247 | Pupitar | Rock/Ground | Evolves from Larvitar at Lv30 |
| Q | |||
| 195 | Quagsire | Water/Ground | Evolves from Wooper at Lv20, Union Cave, Mt. Silver, Ruins of Alph, Route 10, 12, 13, 14, 15, 26, 27, 32 |
| 156 | Quilava | Fire | Evolves from Cyndaquil at Lv14 |
| 211 | Quilfish | Water/Poison | Route 16, 17, 18 (rare), 32 (in swarms) |
| R | |||
| 26 | Raichu | Electric | Evolves from Pikachu with use of a Thunder Stone |
| 243 | Raikou | Electric | After set free in the Burned Tower, it can be found anywhere in Johto |
| 78 | Rapidash | Fire | Evolves fropm Ponyta at Lv40, Mt. Silver |
| 20 | Raticate | Normal | Evolves from Rattata at Lv20, Mt. Mortar, Route 9, 10, 26, 27, 38 |
| 19 | Rattata | Normal | Bellsprout Tower, Mt. Mortar, Route 1, 3, 6, 7, 9, 10, 26, 27 |
| 223 | Remoraid | Water | Route 44 when fishing (in swarms) |
| 112 | Rhydon | Rock/Ground | Evolves from Rhyhorn at Lv42, Mahogany City (trade) |
| 111 | Rhyhorn | Rock/Ground | Victory Road |
| S | |||
| 26 | Sandshrew | Ground | Gold: Union Cave, Mt. Moon, Silver: Goldenrod Game Corner |
| 27 | Sandslash | Ground | Evolves from Sandshrew at Lv22 |
| 212 | Scizor | Bug/Steel | Evolves from Scyther when traded holding Metall Coat |
| 123 | Scyther | Bug/Flying | National Park |
| 117 | Seadra | Water | Evolves from Horsea at Lv32 |
| 119 | Seaking | Water | Evolves from Goldeen at Lv33, Mt. Mortar, Route 9, 10, 24, 25, 26, 27 |
| 86 | Seel | Water | Whirl Islands |
| 161 | Sentret | Normal | Route 1, 29 |
| 90 | Shellder | Water | Cinnabar Island |
| 213 | Shuckle | Bug/Rock | Cianwood (gift), Cianwood (break the rocks) |
| 227 | Skarmory | Steel/Flying | Silver: Route 45, 46 |
| 188 | Skiploom | Grass/Flying | Evolves from Jumpluff at Lv27 |
| 80 | Slowbro | Water/Psychic | Evolves from Slowpoke at Lv37 |
| 199 | Slowking | Water/Psychic | Evolves from Slowbro when traded holding a King Rock |
| 79 | Slowpoke | Water/Psychic | Slowpoke Well |
| 218 | Slugma | Fire | Route 16, 17, 18 |
| 235 | Smeargle | Normal | Outside the Ruins of Alph (in tall grass) |
| 238 | Smoochum | Ice/Psychic | Breed from a Jynx and a Ditto |
| 215 | Sneasel | Dark/Ice | Mt. Silver (night) |
| 143 | Snorlax | Normal | Blocking the way to Diglett's Cave |
| 209 | Snubbull | Normal | Route 38 (in swarms) |
| 21 | Spearow | Normal | Route 3, 4, 7, 9, 10, 29, 42, 46 |
| 167 | Spinarak | Bug/Poison | Route 31, 37 (at night) |
| 7 | Squirtle | Water | R/B/Y |
| 234 | Stantler | Normal | Route Route 37 |
| 121 | Starmie | Water | Evolves from Starmie with use of a Water Stone |
| 120 | Staryu | Water | Cianwood (fishing at night) |
| 208 | Steelix | Steel/Ground | Evolves from Onix when traded holding Metall Coat |
| 185 | Sudowoodo | Rock | Route 36 (blocking your way) |
| 245 | Suicune | Water | After set free in the Burned Tower, it can be found anywhere in Johto |
| 191 | Sunkern | Grass | National Park, Route 24, 25 |
| 192 | Sunflora | Grass | Evolves from Sunkern with use of a Sun Stone |
| 220 | Swinub | Ice/Ground | Ice Path |
| T | |||
| 114 | Tangela | Grass | Mt. Silver, Route 44 |
| 128 | Tauros | Normal | Route 38 |
| 216 | Teddiursa | Normal | Gold: Route 45, 46 |
| 72 | Tentacool | Water/Poison | Anywhere in the sea |
| 73 | Tentacruel | Water/Poison | Evolves from Tentacool at Lv30, anywhere in the sea |
| 175 | Togepi | Normal | Hatches from the Mystery Egg, breed from two Togetic |
| 176 | Togetic | Normal | Evolves from Togepi when happy |
| 158 | Totodile | Water | One of the starting Pokémon in Professor Elm's lab |
| 157 | Typhlosion | Fire | Evolves from Quilava at Lv36 |
| 148 | Tyranitar | Rock/Dark | Evolves from Pupitar at Lv55 |
| 236 | Tyrogue | Fighting | Get it from Black Belt in Mt. Mortar, breed from two Hitmonlee, Hitmonchan or Hitmontop |
| U | |||
| 197 | Umbreon | Dark | Evolves from a happy Eevee at night |
| 201 | Unown | Psychic | Ruins of Alph |
| 217 | Ursaring | Normal | Evolves from Teddiursa at Lv30, Mt. Silver |
| V | |||
| 134 | Vaporeon | Water | Evolves from Eevee with use of a Water Stone |
| 49 | Venomoth | Bug/Poison | Evolves from Venonat at Lv31, Route 24, 25 |
| 48 | Venonat | Bug/Poison | National Park, Route 24, 25, 43 |
| 3 | Venusaur | Grass/Poison | Evolves from Ivysaur at Lv32 |
| 71 | Victreebell | Grass/Poison | Evolves from Weepinbell with use of a Leaf Stone |
| 45 | Vileplume | Grass/Poison | Evolves from Gloom with use of a Leaf Stone |
| 100 | Voltorb | Electric | Olivine (trade), Route 9, 10 |
| 37 | Vulpix | Fire | Silver: Route 7, 8, 36, 37 |
| W | |||
| 8 | Wartortle | Water | Evolves from Squirtle at Lv16 |
| 13 | Weedle | Bug/Poison | National Park, Silver: Route 2, 30, 31 |
| 70 | Weepinbell | Grass/Poison | Evolves from Bellsprout with use of a Leaf Stone |
| 110 | Weezing | Poison | Evolves from Koffing at Lv35 |
| 40 | Wigglytuff | Normal | Evolves from Jigglypuff with use of a Moon Stone |
| 202 | Wobbuffet | Psychic | Dark Cave |
| 194 | Wooper | Water/Ground | Outside Ruins of Alph, Union Cave, Route 32 |
| X | |||
| 178 | Xatu | Psychic/Flying | Evolves from Natu at Lv25 |
| Y | |||
| 193 | Yanma | Bug/Flying | Route 35 (in swarms) |
| Z | |||
| 145 | Zapdos | Electric | R/B/Y |
| 41 | Zubat | Poison/Flying | Dark Cave, Union Cave, Slowpoke Well, Illex Forest, Burnt Tower, Mt. Mortar, Whirl Islands, Ice Path, Mt. Moon, Rock Tunnel |