Pokemon FireRed and LeafGreen Kanto Pokedex
Locations of all 150(+1) Kanto Pokemon in Pokemon FireRed and LeafGreen Versions on the GameBoy Advance. Contains Story Spoilers. Contains the most common/easiest locations or requirements for obtaining each available Pokemon. Pokemon may be found in locations not listed. Information pulled multiple sources including Serebii.net

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Encounter Rates are based off rarities on Serebii.net. Common means 35-100% chance. Uncommon means 15-35% chance. Few means 5-15% chance. Rare means 1-5% chance.
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Pokemon breeding cannot occur until the player reaches the Sevii Islands. This is because breeding did not exist in the original Generation I games.
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If a Pokemon has received an additional evolution in a Generation II or Generation III game they will not be able to evolve until receiving the National Pokedex. The evolution cutscene will occur if the conditions are met but the evolution will be stopped automatically. An example of this is Golbat requiring high friendship to evolve into Crobat.
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#001 Bulbasaur - Starter Pokemon received from Professor Oak in Pallet Town at the start of the adventure
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#002 Ivysaur - Evolve from Bulbasaur (level 16)
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#003 Venusaur - Evolve from Ivysaur (level 32)
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#004 Charmander - Starter Pokemon received from Professor Oak in Pallet Town at the start of the adventure
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#005 Charmeleon - Evolve from Charmander (level 16)
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#006 Charizard - Evolve from Charmeleon (level 36)
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#007 Squirtle - Starter Pokemon received from Professor Oak in Pallet Town at the start of the adventure
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#008 Wartortle - Evolve from Squirtle (level 16)
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#009 Blastoise - Evolve from Wartortle (level 36)
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#010 Caterpie - Viridian Forest, Route 25, Pattern Bush (common)
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#011 Metapod - Evolve from Caterpie (level 7); Viridian Forest, Route 25, Pattern Bush (common)
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#012 Butterfree - Evolve from Metapod (level 10)
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#013 Weedle - Viridian Forest, Route 25, Pattern Bush (common)
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#014 Kakuna - Evolve from Weedle (level 7); Viridian Forest, Route 25, Pattern Bush (common)
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#015 Beedrill - Evolve from Kakuna (level 10)
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#016 Pidgey - Routes 1, 2, and 3 (common)
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#017 Pidgeotto - Evolve from Pidgey (level 18); Routes 13, 14, and 15 (few)
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#018 Pidgeot - Evolve from Pidgeotto (level 36)
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#019 Rattata - Routes 1, 2, and 4 (common)
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#020 Raticate - Evolve from Rattata (level 20); Routes 17 and 18, Pokemon Mansion (few)
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#021 Spearow - Routes 3, 4, and 9 (common)
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#022 Fearow - Evolve from Spearow (level 20); Routes 17, 18, and 23 (uncommon)
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#023 Ekans - FIRERED VERSION EXCLUSIVE - Routes 4, 8, and 9 (common)
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#024 Arbok - FIRERED VERSION EXCLUSIVE - Evolve from Ekans (level 22); Route 23 and Victory Road (uncommon)
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#025 Pikachu - Viridian Forest, Power Plant (rare)
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#026 Raichu - Evolve from Pikachu (Thunderstone - Power Plant, Celadon Department Store).
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#027 Sandshrew - LEAFGREEN VERSION EXCLUSIVE - Routes 4, 8, and 9 (common)
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#028 Sandslash - Evolve from Sandshrew (level 22); Route 23 and Victory Road (uncommon)
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#029 Nidoran (female) - Route 3, Safari Zone Areas 1 and 2 (common in LeafGreen, rare in FireRed)
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#030 Nidorina - Evolve from Nidoran (female) (level 16); Safari Zone Area 2 (uncommon in LeafGreen, rare in FireRed)
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#031 Nidoqueen - Evolve from Nidorina (Moon Stone - Route 2, Mt. Moon, Rocket Hideout, Pokemon Mansion, Joyful Game Corner)
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#032 Nidoran (male) - Route 3, Safari Zone Areas 1 and 2 (common in FireRed, rare in LeafGreen)
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#033 Nidorino - Evolve from Nidoran (male) (level 16); Safari Zone Area 2 (uncommon in FireRed, rare in LeafGreen)
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#034 Nidoking - Evolve from Nidorino (Moon Stone - Route 2, Mt. Moon, Rocket Hideout, Pokemon Mansion, Joyful Game Corner)
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#035 Clefairy - Mt. Moon 1F and B2F (rare)
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#036 Clefable - Evolve from Clefairy (Moon Stone - Route 2, Mt. Moon, Rocket Hideout, Pokemon Mansion, Joyful Game Corner)
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#037 Vulpix - LEAFGREEN VERSION EXCLUSIVE - Routes 7 and 8, Pokemon Mansion 1F/2F/3F/B1F (uncommon)
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#038 Ninetails - Evolve from Vulpix (Fire Stone - Mt. Ember, Celadon Department Store)
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#039 Jigglypuff - Route 3 (few)
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#040 Wigglytuff - Evolve from Jigglypuff (Moon Stone - Route 2, Mt. Moon, Rocket Hideout, Pokemon Mansion, Joyful Game Corner)
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#041 Zubat - Altering Cave, Lost Cave, Mt. Moon 1F and B2F, most other caves (common)
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#042 Golbat - Evolve from Zubat (level 22); Lost Cave, Victory Road 1F/2F/3F, Cerulean Cave 1F/2F/B1F (uncommon)
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#043 Oddish - FIRERED VERSION EXCLUSIVE - Routes 5, 6, and 7 (common)
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#044 Gloom - FIRERED VERSION EXCLUSIVE - Evolve from Oddish (level 21); Routes 12, 13, and 14 (common)
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#045 Vileplume - Evolve from Gloom (Leaf Stone - Safari Zone, Celadon Department Store)
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#046 Paras - Mt. Moon 1F/B1F/B2F; Safari Zone Areas 1 and 2 (common)
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#047 Parasect - Evolve from Paras (level 24); Safari Zone Area 1, Cerulean Cave 1F/2F/B1F (few)
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#048 Venonat - Routes 12, 13, and 14 (common)
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#049 Venomoth - Evolve from Venonat (level 31); Safari Zone Areas 2 and 3, Berry Forest (rare)
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#050 Diglett - Diglett's Cave
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#051 Dugtrio - Evolve from Diglett (level 26); Diglett's Cave
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#052 Meowth - Routes 5, 6, and 7 (common)
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#053 Persian - Evolve from Meowth (level 28); Kindle Road, Seavault Canyon, Treasure Beach (rare)
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#054 Psyduck - FIRERED VERSION EXCLUSIVE - Route 6, Cerulean Cave 1F and B1F (surfing, common)
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#055 Golduck - FIRERED VERSION EXCLUSIVE - Evolve from Psyduck (level 33); Cerulean Cave 1F and B1F (uncommon, surfing)
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#056 Mankey - Routes 3 and 4, Rock Tunnel 1F and B1F (common)
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#057 Primeape - Evolve from Mankey (level 28); Route 23, Victory Road 2F, Cerulean Cave 1F (few)
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#058 Growlithe - FIRERED VERSION EXCLUSIVE - Routes 7 and 8, Pokemon Mansion 1F/2F/3F/B1F (uncommon)
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#059 Arcanine - Evolve from Growlithe (Fire Stone - Mt. Ember, Celadon Department Store)
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#060 Poliwag - Routes 6, 22, and 23 (good rod/super rod, common)
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#061 Poliwhirl - Evolve from Poliwag (level 25); Routes 6, 22, and 23 (super rod, uncommon)
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#062 Poliwrath - Evolve from Poliwhirl (Water Stone - Seafoam Islands, Celadon Department Store)
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#063 Abra - Routes 24 and 25 (uncommon)
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#064 Kadabra - Evolve from Abra (level 16); Cerulean Cave 2F and B1F (uncommon)
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#065 Alakazam - Evolve from Kadabra (link-trade with another player)
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#066 Machop - Rock Tunnel 1F and B1F, Victory Road 1F/2F/3F (common)
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#067 Machoke - Evolve from Machop (level 28); Victory Road 1F/2F/3F, Cerulean Cave 1F/2F/B1F (few)
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#068 Machamp - Evolve from Machoke (link-trade with another player)
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#069 Bellsprout - LEAFGREEN VERSION EXCLUSIVE - Routes 5, 6, and 7 (common)
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#070 Weepinbell - LEAFGREEN VERSION EXCLUSIVE - Evolve from Bellsprout (level 21); Routes 12, 13, and 14 (uncommon)
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#071 Victreebell - Evolve from Weepinbell (Leaf Stone - Safari Zone, Celadon Department Store)
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#072 Tentacool - Routes 19, 20, and 21 (surfing, common)
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#073 Tentacruel - Evolve from Tentacool (level 30); One Island, Kindle Road Five Island (surfing, rare)
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#074 Geodude - Mt. Ember (walking, rock smash, few), Victory Road (walking, uncommon)
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#075 Graveler - Evolve from Geodude (level 25); Mt. Ember (rock smash, rare), Cerulean Cave (rock smash, uncommon)
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#076 Golem - Evolve from Graveler (link-trade with another player)
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#077 Ponyta - Kindle Road, Mt. Ember Base (common)
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#078 Rapidash - Evolve from Ponyta (level 40); Kindle Road, Mt. Ember Base (rare)
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#079 Slowpoke - LEAFGREEN VERSION EXCLUSIVE - Route 6, Cerulean Cave 1F and B1F (surfing, common)
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#080 Slowbro - LEAFGREEN VERSION EXCLUSIVE - Evolve from Slowpoke (level 37); Cerulean Cave 1F and B1F (uncommon, surfing)
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#081 Magnemite - Power Plant (common)
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#082 Magneton - Evolve from Magnemite (level 30); Power Plant, Cerulean Cave 1F/2F/B1F (few)
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#083 Farfetch'd - Trade a Spearow to a child in a house in Vermilion City
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#084 Doduo - Routes 16, 17, and 18 (common)
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#085 Dodrio - Evolve from Doduo (level 31)
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#086 Seel - Seafoam Islands B1F/B2F/B3F/B4F (walking and surfing, common)
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#087 Dewgong - Evolve from Seel (level 34); Seafoam Islands B3F and B4F (walking and surfing, rare)
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#088 Grimer - Celadon City (super rod, rare), Pokemon Mansion 1F/2F/3F/B1F (uncommon in LeafGreen, rare in FireRed)
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#089 Muk - LEAFGREEN VERSION SEMI-EXCLUSIVE - Evolve from Grimer (level 38); Pokemon Mansion 1F/2F/3F/B1F (rare)
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#090 Shellder - FIRERED VERSION EXCLUSIVE - Cinnabar Island, Pallet Town (super rod, uncommon)
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#091 Cloyster - Evolve from Shellder (Water Stone - Seafoam Islands, Celadon Department Store)
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#092 Gastly - Pokemon Tower 3F-7F, Lost Cave (common)
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#093 Haunter - Evolve from Gastly (level 25); Pokemon Tower 3F-7F, Lost Cave (few)
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#094 Gengar - Evolve from Haunter (link-trade with another player)
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#095 Onix - Rock Tunnel 1F and B1F, Victory Road 1F/2F/3F (uncommon)
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#096 Drowzee - Route 11, Berry Forest (uncommon)
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#097 Hypno - Evolve from Drowzee (level 26); Berry Forest (rare)
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#098 Krabby - Routes 4, 10, and 11 (good rod/super rod, common in LeafGreen | good rod, uncommon in FireRed)
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#099 Kingler - LEAFGREEN VERSION SEMI-EXCLUSIVE - Evolve from Krabby (level 28); Pallet Town, One Island, Kindle Road (super rod, rare)
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#100 Voltorb - Route 10, Power Plant (common)
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#101 Electrode - Evolve from Voltorb (level 30); Cerulean Cave 1F/2F/B1F (rare)
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#102 Exeggcute - Safari Zone Areas 1/2/3/Center, Berry Forest (uncommon)
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#103 Exeggutor - Evolve from Exeggcute (Leaf Stone - Safari Zone, Celadon Department Store)
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#104 Cubone - Pokemon Tower 3F-7F, Seavault Canyon (few)
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#105 Marowak - Evolve from Cubone (level 28); Victory Road 1F/2F/3F, Seavault Canyon (few)
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#106 Hitmonlee - Gift Pokemon after defeating the Saffron City Fighting Dojo (only one of the two choices)
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#107 Hitmonchan - Gift Pokemon after defeating the Saffron City Fighting Dojo (only one of the two choices)
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#108 Lickitung - Trade a Golduck (FireRed) or a Slowbro (LeafGreen) to a trainer on the second floor of the Route 18 Guardhouse
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#109 Koffing - Celadon City (surfing, rare), Pokemon Mansion 1F/2F/3F/B1F (uncommon in LeafGreen, rare in FireRed)
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#110 Wheezing - FIRERED VERSION SEMI-EXCLUSIVE - Evolve from Koffing (level 35); Pokemon Mansion 1F/2F/3F/B1F (rare)
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#111 Rhyhorn - Safari Zone Area 2 and Center (common)
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#112 Rhydon - Evolve from Rhyhorn (level 42)
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#113 Chansey - Safari Zone Area 2 and Center (rare)
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#114 Tangela - Route 21 Grass (common)
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#115 Kanaskhan - Safari Zone Areas 1 and 3 (rare)
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#116 Horsea - Routes 4, 10, and 11 (good rod/super rod, common in FireRed | good rod, uncommon in LeafGreen)
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#117 Seadra - FIRERED VERSION SEMI-EXCLUSIVE - Evolve from Horsea (level 32); Pallet Town, One Island, Kindle Road (super rod, rare)
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#118 Goldeen - Routes 6, 22, and 23 (good rod, uncommon)
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#119 Seaking - Evolve from Goldeen (level 33); Safari Zone Areas 1/2/3/Center (super rod, rare)
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#120 Staryu - LEAFGREEN VERSION EXCLUSIVE - Cinnabar Island, Pallet Town (super rod, uncommon)
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#121 Starmie - Evolve from Staryu (Water Stone - Seafoam Islands, Celadon Department Store)
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#122 Mr. Mime - Trade an Abra to a boy in the house outside of Diglett's Cave on Route 2
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#123 Scyther - Safari Zone Area 1 and Center (rare)
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#124 Jynx - Trade a Poliwhirl to an old man in the house next to the Pokemon Center in Cerulean City
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#125 Electabuzz - FIRERED VERSION EXCLUSIVE - Power Plant (rare)
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#126 Magmar - LEAFGREEN VERSION EXCLUSIVE - Mt. Ember Base (rare)
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#127 Pinsir - LEAFGREEN VERSION EXCLUSICE - Safari Zone Area 1 and Center (rare)
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#128 Tauros - Safari Zone Areas 2 and 3 (rare)
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#129 Magikarp - Anywhere able to fish (old rod, common)
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#130 Gyarados - Evolve from Magikarp (level 20); Routes 4, 6, and 10 (super rod, uncommon)
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#131 Lapras - Gift Pokemon received from Silph Co. Employee during Team Rocket's Invasion of Silph Co. after defeating Blue; Icefall Cave 1F (surfing, rare)
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#132 Ditto - Routes 13, 14, and 15 (uncommon)
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#133 Eevee - Gift Pokemon received on the top floor of the Celadon Mansion in Celadon City, enter in the back door (only one per game)
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#134 Vaporeon - Evolve from Eevee (Water Stone - Seafoam Islands, Celadon Department Store)
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#135 Jolteon - Evolve from Eevee (Thunderstone - Power Plant, Celadon Department Store)
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#136 Flareon - Evolve from Eevee (Fire Stone - Mt. Ember, Celadon Department Store)
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#137 Porygon - Celadon Game Corner (9999 Coins in FireRed, 6500 Coins in LeafGreen)
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#138 Omanyte - Receive the Helix Fossil in Mt. Moon and have it revived on Cinnabar Island (if chose the Dome Fossil, will need to link-trade with another player)
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#139 Omastar - Evolve from Omanyte (level 40)
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#140 Kabuto - Receive the Dome Fossil in Mt. Moon and have it revived on Cinnabar Island (if chose the Helix Fossil, will need to link-trade with another player)
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#141 Kabutops - Evolve from Kabuto (level 40)
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#142 Aerodactyl - Receive the Old Amber at the Pewter City Museum and have it revived on Cinnabar Island (requires Cut)
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#143 Snorlax - Static Encounters on Route 12 and Route 16, requiring the Poke Flute
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#144 Articuno - Static Encounter at Seafoam Islands B4F
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#145 Zapdos - Static Encounter at Power Plant
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#146 Moltres - Static Encounter on the Mt. Ember Peak
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#147 Dratini - Safari Zone Areas 1/2/3/Center (super rod, uncommon)
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#148 Dragonair - Evolve from Dratini (level 30); Safari Zone Areas 1/2/3/Center (super rod, rare)
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#149 Dragonite - Evolve from Dragonair (level 55)
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#150 Mewtwo - Static Encounter in Cerulean Cave B1F
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#151 Mew - Event Pokemon not obtainable via standard gameplay. May be traded from Emerald if used a cheating device to complete the Faraway Island event or may be added by a cheating device directly.