| 1 | Bulbasaur | Crystal | Time Capsule, Event| 2 | Ivysaur | Crystal | Time Capsule | 3 | Venusaur | Crystal | Time Capsule, Event | 4 | Charmander | Crystal | Time Capsule, Event | 5 | Charmeleon | Crystal | Time Capsule, Evolve Charmander (Lv. 16) | 6 | Charizard | Crystal | Time Capsule, Event, Evolve Charmeleon (Lv. 36) | 7 | Squirtle | Crystal | Time Capsule, Event | 8 | Wartortle | Crystal | Time Capsule, Evolve Squirtle (Lv. 16) | 9 | Blastoise | Crystal | Time Capsule, Event | 10 | Caterpie | Crystal | Routes 2, 24, 25, 30, and 31, Ilex Forest and National Park (Morning/Day)
| National Park (Bug-Catching Contest) Ilex Forest (Headbutt trees) 11 | Metapod | Crystal | Routes 24, 25, Ilex Forest (Morning/Day)
| National Park (Bug-Catching Contest) Ilex Forest (Headbutt trees) 12 | Butterfree | Crystal | Routes 2, 24, 25 (Morning/Day)
| National Park (Bug-Catching Contest) Ilex Forest (Headbutt trees) 13 | Weedle | Crystal | Routes 30, 31, Ilex Forest, National Park (Morning/Day)
| National Park (Bug-Catching Contest) Ilex Forest (Headbutt trees) 14 | Kakuna | Crystal | Ilex Forest (Morning/Day)
| National Park (Bug-Catching Contest) Ilex Forest (Headbutt trees) 15 | Beedrill | Crystal | National Park (Bug-Catching Contest)
| Ilex Forest (Headbutt trees) 16 | Pidgey | Crystal | Routes 1, 2, 5, 25, 29, 30, 31, 32, 34, 35, 36, 37, National Park, Ilex Forest (Morning/Day) | 17 | Pidgeotto | Crystal | Route 2 (Day)
Route 5, 8, 11, 13, 14, 15, 25, 37, 38, 39, 43 (Morning/Day) | 18 | Pidgeot | Crystal | Evolve Pidgeotto (Lv. 36) | 19 | Rattata | Crystal | Routes 1, 3, 4, 9, 21, 22, 29, 32, 33, 34, 42, 46, Tin Tower, Mt. Mortar, Union Cave, Tohjo Falls, Sprout Tower, Burned Tower
| Routes 6, 7, 11, 38, 39 (Morning/Day) 20 | Raticate | Crystal | Routes 3, 4, 6, 7, 9, 10, 11, 21, 26, 27, 38, 39, 42, 43, Mt. Mortar, Union Cave, Tohjo Falls, Burned Tower
| Route 1 (Night) Route 7 (Morning/Day) 21 | Spearow | Crystal | Routes 3, 4, 7, 9, 10, 22, 33, 42, 46 (Morning/Day)
| Azalea Town, Routes 33, 42, 44 (Headbutt trees) Route 35 (Randy) 22 | Fearow | Crystal | Routes 9, 10, 16, 17, 18, 22, 42 (Morning/Day) | 23 | Ekans | Crystal | Routes 3, 4, 32, 33, 42 (Morning/Day)
| Routes 26, 27, 32, 33, 42, Azalea Town (Headbutt trees) 24 | Arbok | Crystal | Routes 3, 4, 26, 27, 28, 42, Mt. Silver (Morning/Day) | 25 | Pikachu | Crystal | Route 2 (Morning/Day), Celadon Game Corner | 26 | Raichu | Crystal | Evolve Pikachu (Thunder Stone) | 27 | Sandshrew | Crystal | Routes 3, 4, Union Cave, Mt. Moon (Morning/Day) | 28 | Sandslash | Crystal | Route 26, Victory Road (Morning/Day) | 29 | NidoranF | Crystal | National Park (Morning/Day)
| Route 35 (Swarm) 30 | Nidorina | Crystal | Routes 13, 14, 15 (Morning/Day) | 31 | Nidoqueen | Crystal | Evolve Nidorina (Moon Stone) | 32 | NidoranM | Crystal | National Park (Morning/Day)
| Route 35 (Swarm) 33 | Nidorino | Crystal | Routes 13, 14, 15 (Morning/Day) | 34 | Nidoking | Crystal | Evolve Nidorino (Moon Stone) | 35 | Clefairy | Crystal | Mt. Moon
| Routes 3, 4 (Night) 36 | Clefable | Crystal | Evolve Clefairy (Moon Stone) | 37 | Vulipx | Crystal | Trade | 38 | Ninetales | Crystal | Trade | 39 | Jigglypuff | Crystal | Routes 5, 6, 7, 8, 34, 35 | 40 | Wigglytuff | Crystal | Evolve Jigglypuff (Moon Stone) | 41 | Zubat | Crystal | Rock Tunnel, Whirl Islands, Mt. Moon, Dark Cave, Ice Path, Mt. Mortar, Union Cave, Tohjo Falls, Burned Tower, Slowpoke Well
| Routes 3, 4, 9, 10, 30, 31, 32, 33, 42 (Night) 42 | Golbat | Crystal | Dark Cave (Blackthorn City side), Union Cave, Slowpoke Well, Mt. Mortar, Whirl Islands, Ice Path, Mt. Silver interior, Victory Road, , Tohjo Falls
| Routes 28, 42, Rock Tunnel, Mt. Silver Entrance (Night) 43 | Oddish | Crystal | Routes 24, 25, Ilex Forest (Night) | 44 | Gloom | Crystal | Route 24 (Night) | 45 | Vileplume | Crystal | Evolve Gloom (Leaf Stone) | 46 | Paras | Crystal | National Park (Bug-Catching Contest)
| Ilex Forest, Mt. Moon 47 | Parasect | Crystal | Mt. Silver Cave | 48 | Venonat | Crystal | Routes 9, 10, 13, 14, 15, 24, 25, 43, Ilex Forest, National Park (Night)
| National Park (Bug-Catching Contest) Route 43, Lake of Rage (Headbutt trees) 49 | Venomoth | Crystal | Routes 9, 10, 13, 14, 15, 43 (Night) | 50 | Diglett | Crystal | Diglett's Cave | 51 | Dugtrio | Crystal | Diglett's Cave | 52 | Meowth | Crystal | Routes 5, 6, 7, 8, 11, 38, 39 (Night) | 53 | Persian | Crystal | Route 7 (Night) | 54 | Psyduck | Crystal | Route 6, 35, Ilex Forest (Surfing)
| Routes 6, 35, Ilex Forest, National Park (Night) 55 | Golduck | Crystal | Routes 6, 35, Ilex Forest, Mt. Silver (Surfing)
| Mt. Silver (Night) 56 | Mankey | Crystal | Trade | 57 | Primeape | Crystal | Trade | 58 | Growlithe | Crystal | Routes 8, 35, 36, 37 (Morning/Day) | 59 | Arcanine | Crystal | Evolve Growlithe (Fire Stone) | 60 | Poliwag | Crystal | Routes 22, 28, 30, 31, 44, Violet City, Ecruteak City, Viridian City, Mt. Silver Exterior (Surfing and fishing)
| Routes 6, 35, 43, Ruins of Alph, Ilex Forest, Blackthorn City (Fishing) Routes 22, 30, 31, 44 (Night) 61 | Poliwhirl | Crystal | Routes 22, 28, 30, 31, and 44, Violet City, Ecruteak City, Viridian City, Mt. Silver (Surfing)
| Routes 28 and 44, Mt. Silver (Tall grass) (Night) 62 | Poliwrath | Crystal | Evolve Poliwhirl (Water Stone) | 63 | Abra | Crystal | Routes 5, 7, 8, 24, 34, 35, Goldenrod Game Corner | 64 | Kadabra | Crystal | Route 8 | 65 | Alakazam | Crystal | Evolve Kadabra (Trade) | 66 | Machop | Crystal | Rock Tunnel, Mt. Mortar (Morning/Day)
| Trade Drowzee in Goldenrod Department Store 67 | Machoke | Crystal | Mt. Mortar, Mt. Silver, Rock Tunnel (Morning/Day) | 68 | Machamp | Crystal | Evolve Machoke (Trade) | 69 | Bellsprout | Crystal | Routes 24, 25, 31, 32, 36, 44 | 70 | Weepinbell | Crystal | Route 44 | 71 | Victreebel | Crystal | Evolve Weepinbell (Leaf Stone) | 72 | Tentacool | Crystal | Routes 20, 21, 26, 27, 41, New Bark Town, Pallet Town, Vermilion City, Olivine City, Cinnabar Island (Surfing, Old/Good Rod)
| Routes 19, 34, 40, Olivine City, Cherrygrove City, Cianwood City, Whirl Islands, Union Cave (Surfing) Routes 12, 13, 32 (Surfing or fishing) 73 | Tentacruel | Crystal | Routes 20, 21, 26, 27, 41, New Bark Town, Olivine City, Pallet Town, Vermilion City, Cinnabar Island (Surfing and Super Rod)
| Routes 12, 13, 19, 32, 34, 40, Cherrygrove City, Cianwood City, Whirl Islands, Union Cave (Surfing) 74 | Geodude | Crystal | Routes 33, 45, 46, Mt. Mortar, Dark Cave, Union Cave, Mt. Moon, Rock Tunnel
| Team Rocket HQ 75 | Graveler | Crystal | Route 45, Victory Road, Dark Cave, Mt. Mortar, Silver Cave | 76 | Golem | Crystal | Evolve Graveler (Trade) | 77 | Ponyta | Crystal | Routes 22, 26, 27, 28, Mt. Silver (Morning/Day) | 78 | Rapidash | Crystal | Route 28, Mt. Silver (Morning/Day) | 79 | Slowpoke | Crystal | Slowpoke Well, Tohjo Falls (Walking and surfing) | 80 | Slowbro | Crystal | Slowpoke Well (Surfing) | 81 | Magnemite | Crystal | Routes 6, 11, 38, 39 | 82 | Magneton | Crystal | Trade Dugtrio in Power Plant | 83 | Farfetch'd | Crystal | Route 43 (Morning/Day) | |