Pokémon Red and Blue/Encounter Rates

Here you will find a centralized list of which Pokémon can be found in the various locations in the game.

Route 1
In the tall grass
 * 016 - Pidgey
 * Pokémon Red: 55% encounter rate
 * Pokémon Blue: 55% encounter rate
 * 019 - Rattata
 * Pokémon Red: 45% encounter rate
 * Pokémon Blue: 45% encounter rate

Route 2
In the tall grass
 * 010 - Caterpie
 * Pokémon Red: Does not appear
 * Pokémon Blue: 15% encounter rate
 * 013 - Weedle
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: Does not appear
 * 016 - Pidgey
 * Pokémon Red: 40% encounter rate
 * Pokémon Blue: 40% encounter rate
 * 019 - Rattata
 * Pokémon Red: 45% encounter rate
 * Pokémon Blue: 45% encounter rate

Route 3
In the tall grass


 * 016 - Pidgey
 * Pokémon Red: 50% encounter rate
 * Pokémon Blue: 50% encounter rate
 * 021 - Spearow
 * Pokémon Red: 40% encounter rate
 * Pokémon Blue: 40% encounter rate
 * 039 - Jigglypuff
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate

Route 4
In the tall grass
 * 019 - Rattata
 * Pokémon Red: 45% encounter rate
 * Pokémon Blue: 45% encounter rate
 * 021 - Spearow
 * Pokémon Red: 30% encounter rate
 * Pokémon Blue: 30% encounter rate
 * 023 - Ekans
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 027 - Sandshrew
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate

Route 5 & Route 6
In the tall grass


 * 016 - Pidgey
 * Pokémon Red: 35% encounter rate
 * Pokémon Blue: 35% encounter rate
 * 043 - Oddish
 * Pokémon Red: 40% encounter rate
 * Pokémon Blue: Does not appear
 * 052 - Meowth
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate
 * 056 - Mankey
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 069 - Bellsprout
 * Pokémon Red: Does not appear
 * Pokémon Blue: 40% encounter rate

Route 7
In the tall grass


 * 026 - Pidgey
 * Pokémon Red: 35% encounter rate
 * Pokémon Blue: 35% encounter rate
 * 037 - Vulpix
 * Pokémon Red: Does not appear
 * Pokémon Blue: 10% encounter rate
 * 043 - Oddish
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 069 - Bellsprout
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate
 * 052 - Meowth
 * Pokémon Red: Does not appear
 * Pokémon Blue: 30% encounter rate
 * 056 - Mankey
 * Pokémon Red: 30% encounter rate
 * Pokémon Blue: Does not appear
 * 058 - Growlithe
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: Does not appear

Route 8
In the tall grass


 * 016 - Pidgey
 * Pokémon Red: 35% encounter rate
 * Pokémon Blue: 35% encounter rate
 * 023 - Ekans
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: Does not appear
 * 027 - Sandshrew
 * Pokémon Red: Does not appear
 * Pokémon Blue: 20% encounter rate
 * 037 - Vulpix
 * Pokémon Red: Does not appear
 * Pokémon Blue: 20% encounter rate
 * 052 - Meowth
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate
 * 056 - Mankey
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 058 - Growlithe
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: Does not appear

Route 9
In the tall grass
 * 021 - Spearow
 * Pokémon Red: 30% encounter rate
 * Pokémon Blue: 30% encounter rate
 * 019 - Rattata
 * Pokémon Red: 45% encounter rate
 * Pokémon Blue: 45% encounter rate
 * 023 - Ekans
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 027 - Sandshrew
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate

Route 10
In the tall grass
 * 021 - Spearow
 * Pokémon Red: 30% encounter rate
 * Pokémon Blue: 30% encounter rate
 * 023 - Ekans
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 027 - Sandshrew
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate
 * 100 - Voltorb
 * Pokémon Red: 45% encounter rate
 * Pokémon Blue: 45% encounter rate

Route 11
In the tall grass
 * 021 - Spearow
 * Pokémon Red: 30% encounter rate
 * Pokémon Blue: 30% encounter rate
 * 023 - Ekans
 * Pokémon Red: 45% encounter rate
 * Pokémon Blue: Does not appear
 * 027 - Sandshrew
 * Pokémon Red: Does not appear
 * Pokémon Blue: 45% encounter rate
 * 096 - Drowzee
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate

Route 12
In the tall grass

Fishing with the Old Rod
 * 016 - Pidgey
 * Pokémon Red: 35% encounter rate
 * Pokémon Blue: 35% encounter rate
 * 047 - Venonat
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: 20% encounte rate
 * 043 - Oddish
 * Pokémon Red: 40% encounter rate
 * Pokémon Blue: Does not appear
 * 044 - Gloom
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 069 - Bellsprout
 * Pokémon Red: Does not appear
 * Pokémon Blue: 40% encounter rate
 * 070 - Weepinbell
 * Pokémon Red: Does not appear
 * Pokémon Blue: 5% encounter rate


 * 129 - Magikarp
 * Pokémon Red: 100% encounter rate
 * Pokémon Blue: 100% encounter rate

Fishing with the Super Rod


 * 072 - Tentacool
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 098 - Krabby
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 118 - Goldeen
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 127 - Magikarp
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate

Route 13
In the tall grass


 * 016 - Pidgey
 * Pokémon Red: 30% encounter rate
 * Pokémon Blue: 30% encounter rate
 * 047 - Venonat
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: 20% encounter rate
 * 069 - Bellsprout
 * Pokémon Red: Does not appear
 * Pokémon Blue: 40% encounter rate
 * 070 - Weepinbell
 * Pokémon Red: Does not appear
 * Pokémon Blue: 5% encounter rate
 * 043 - Oddish
 * Pokémon Red: 40% encounter rate
 * Pokémon Blue: Does not appear
 * 044 - Gloom
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: Does not appear
 * 132 - Ditto
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate

Fishing with the Old Rod


 * 129 - Magikarp
 * Pokémon Red: 100% encounter rate
 * Pokémon Blue: 100% encounter rate

Fishing with the Super Rod


 * 072 - Tentacool
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 089 - Krabby
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 118 - Goldeen
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 129 - Magikarp
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate

Route 14 & Route 15
In the tall grass


 * 016 - Pidgey
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 043 - Oddish
 * Pokémon Red: 40% encounter rate
 * Pokémon Blue: Does not appear
 * 044 - Gloom
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: Does not appear
 * 047 - Venonat
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 069 - Bellsprout
 * Pokémon Red: Does not appear
 * Pokémon Blue: 40% encounter rate
 * 070 - Weepinbell
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: Does not appear
 * 132 - Ditto
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate

Route 16
In the tall grass


 * 019 - Rattata
 * Pokémon Red: 30% encounter rate
 * Pokémon Blue: 30% encounter rate
 * 020 - Raticate
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 021 - Spearow
 * Pokémon Red: 40% encounter rate
 * Pokémon Blue: 40% encounter rate

Route 17
In the tall grass


 * 020 - Raticate
 * Pokémon Red: 30% encounter rate
 * Pokémon Blue: 30% encounter rate
 * 021 - Spearow
 * Pokémon Red: 40% encounter rate
 * Pokémon Blue: 40% encounter rare
 * 022 - Fearow
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 084 - Doduo
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate

Route 18
In the tall grass


 * 020 - Raticate
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: 20% encounter rate
 * 021 - Spearow
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: 20% encounter rate
 * 022 - Fearow
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 084 - Doduo
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate

Fishing with the Old Rod


 * 129 - Magikarp
 * Pokémon Red: 100% encounter rate
 * Pokémon Blue: 100% encounter rate

Fishing with the Super Rod


 * 072 - Tentacool
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 098 - Krabby
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 118 - Goldeen
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 129 - Magikarp
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * Pokémon Blue: 25% encounter rate

Route 19 & Route 20

 * 072 - Tentacool
 * Pokémon Red: 100% encounter rate
 * Pokémon Blue: 100% encounter rate

Route 21
In the tall grass


 * 016 - Pidgey
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 019 - Rattata
 * Pokémon Red: 35% encounter rate
 * Pokémon Blue: 35% encounter rate
 * 020 - Radicate
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 114 - Tangela
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate

On the water surface


 * 072 - Tentacool
 * Pokémon Red: 100% encounter rate
 * Pokémon Blue: 100% encounter rate

Fishing with the Old Rod


 * 129 - Magikarp
 * Pokémon Red: 100% encounter rate
 * Pokémon Blue: 100% encounter rate

Fishing with the Super Rod


 * 090 - Shellder
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 116 - Horsea
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 118 - Goldeen
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 120 - Staryu
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate

Route 22
In the tall grass


 * 010 - Caterpie
 * Pokémon Red: Does not appear
 * Pokémon Blue: 15% encounter rate
 * 013 - Weedle
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: Does not appear
 * 016 - Pidgey
 * Pokémon Red: 45% encounter rate
 * Pokémon Blue: 45% encounter rate
 * 019 - Rattata
 * Pokémon Red: 40% encounter rate
 * Pokémon Blue: 40% encounter rate

Route 24
In the tall grass

Fishing with the Old Rod
 * 010 - Caterpie
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate
 * 011 - Metapod
 * Pokémon Red: Does not appear
 * Pokémon Blue: 15% encounter rate
 * 013 - Weedle
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 014 - Kakuna
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 016 - Pidgey
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: 20% encounter rate
 * 063 - Abra
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 069 - Bellsprout
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate


 * 129 - Magikarp
 * Pokémon Red: 100% encounter rate
 * Pokémon Blue: 100% encounter rate

Route 25
In the tall grass


 * 010 - Caterpie
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: 20% encounter rate
 * 011 - Metapod
 * Pokémon Red: 4% encounter rate
 * Pokémon Blue: 20% encounter rate
 * 013 - Weedle
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: 1% encounter rate
 * 014 - Kakuna
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: 4% encounter rate
 * 016 - Pidgey
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 043 - Oddish
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 063 - Abra
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 069 - Bellsprout
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate

Diglett’s Cave
Anywhere
 * 050 - Diglett
 * Pokémon Red: 95% encounter rate
 * Pokémon Blue: 95% encounter rate
 * 051 - Dugtrio
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate

Mt. Moon
First floor (anywhere)


 * 035 - Clefairy
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: 1% encounter rate
 * 041 - Zubat
 * Pokémon Red: 79% encounter rate
 * Pokémon Blue: 79% encounter rate
 * 046 - Paras
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 074 - Geodude
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate

Connecting tunnels (anywhere)


 * 035 - Clefairy
 * Pokémon Red: 4% encounter rate
 * Pokémon Blue: 4% encounter rate
 * 041 - Zubat
 * Pokémon Red: 60% encounter rate
 * Pokémon Blue: 60% encounter rate
 * 046 - Paras
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate
 * 074 - Geodude
 * Pokémon Red: 26% encounter rate
 * Pokémon Blue: 26% encounter rate

Deepest floor (anywhere)


 * 035 - Clefairy
 * Pokémon Red: 6% encounter rate
 * Pokémon Blue: 6% encounter rate
 * 041 - Zubat
 * Pokémon Red: 54% encounter rate
 * Pokémon Blue: 54% encounter rate
 * 046 - Paras
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 074 - Geodude
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate

Pokémon Tower
Third floor (anywhere)


 * 092 - Gastly
 * Pokémon Red: 90% encounter rate
 * Pokémon Blue: 90% encounter rate
 * 093 - Haunter
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: 1% encounter rate
 * 104 - Cubone
 * Pokémon Red: 9% encounter rate
 * Pokémon Blue: 9% encounter rate

Fourth floor (anywhere)


 * 092 - Gastly
 * Pokémon Red: 86% encounter rate
 * Pokémon Blue: 86% encounter rate
 * 093 - Haunter
 * Pokémon Red: 9% encounter rate
 * Pokémon Blue: 9% encounter rate
 * 104 - Cubone
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate

Fifth floor (anywhere)


 * 092 - Gastly
 * Pokémon Red: 86% encounter rate
 * Pokémon Blue: 86% encounter rate
 * 093 - Haunter
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 104 - Cubone
 * Pokémon Red: 9% encounter rate
 * Pokémon Blue: 9% encounter rate

Sixth floor (anywhere)


 * 092 - Gastly
 * Pokémon Red: 85% encounter rate
 * Pokémon Blue: 85% encounter rate
 * 093 - Haunter
 * Pokémon Red: 6% encounter rate
 * Pokémon Blue: 6% encounter rate
 * 104 - Cubone
 * Pokémon Red: 9% encounter rate
 * Pokémon Blue: 9% encounter rate

Seventh floor (anywhere)


 * 092 - Gastly
 * Pokémon Red: 75% encounter rate
 * Pokémon Blue: 75% encounter rate
 * 093 - Haunter
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 104 - Cubone
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate

Rock Tunnel
Upper floor (anywhere)


 * 041 - Zubat
 * Pokémon Red: 55% encounter rate
 * Pokémon Blue 55% encounter rate
 * 066 - Machop
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 074 - Geodude
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 095 - Onix
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate

Lower floor (anywhere)


 * 041 - Zubat
 * Pokémon Red: 50% encounter rate
 * Pokémon Blue 50% encounter rate
 * 066 - Machop
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 074 - Geodude
 * Pokémon Red: 26% encounter rate
 * Pokémon Blue: 26% encounter rate
 * 095 - Onix
 * Pokémon Red: 9% encounter rate
 * Pokémon Blue: 9% encounter rate

Safari Zone – Entrance
In the tall grass

Fishing with the Old Rod
 * 029 - Nidoran ♀
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 10% encounter rate
 * 030 - Nidorina
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate
 * 029 - Nidoran ♂︎
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 033 - Nidorino
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: 20% encounter rate
 * 102 - Exeggcute
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: 20% encounter rate
 * 047 - Parasect
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 047 - Venonat
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 111 - Rhyhorn
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 113 - Chansey
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: 1% encounter rate
 * 123 - Scyther
 * Pokémon Red: 4% encounter rate
 * Pokémon Blue: Does not appear


 * 129 - Magikarp
 * Pokémon Red: 100% encounter rate
 * Pokémon Blue: 100% encounter rate

Fishing with the Super Rod


 * 089 - Krabby
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 054 - Psyduck
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 079 - Slowpoke
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 147 - Dratini
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate

Safari Zone – East Area
In the tall grass
 * 029 - Nidoran ♀
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 030 - Nidorina
 * Pokémon Red: Does not appear
 * Pokémon Blue: 10% encounter rate
 * 032 - Nidoran ♂
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 033 - Nidorino
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: Does not appear
 * 046 - Paras
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 084 - Doduo
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate


 * 102 - Exeggcute
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: 20% encounter rate
 * 115 - Kangaskhan
 * Pokémon Red: 4% encounter rate
 * Pokémon Blue: 4% encounter rate
 * 123 - Scyther
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: Does not appear
 * 127 - Pinsir
 * Pokémon Red: Does not appear
 * Pokémon Blue: 1% encounter rate

Safari Zone – North Area
In the tall grass


 * 029 - Nidoran ♀
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate
 * 030 - Nidorina
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 10% encounter rate
 * 032 - Nidoran ♂
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 033 - Nidorino
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 046 - Paras
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 049 - Venomoth
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 102 - Exeggcute
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: 20% encounter rate
 * 111 - Rhyhorn
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 113 - Chansey
 * Pokémon Red: 4% encounter rate
 * Pokémon Blue: 4% encounter rate
 * 128 - Tauros
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: 1% encounter rate

Safari Zone – West Area
In the tall grass


 * 029 - Nidoran ♀
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 030 - Nidorina
 * Pokémon Red: Does not appear
 * Pokémon Blue: 10% encounter rate
 * 032 - Nidoran ♂
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 033 - Nidorino
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: Does not appear
 * 102 - Exeggcute
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: 20% encounter rate
 * 084 - Doduo
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 048 - Venonat
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 115 - Kangaskhan
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: 1% encounter rate
 * 128 - Tauros
 * Pokémon Red: 4% encounter rate
 * Pokémon Blue: 4% encounter rate

Seafoam Island
Ground floor (anywhere) Basement 1 (anywhere) Basement 2 (anywhere)
 * 041 - Zubat
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate
 * 042 - Golbat
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 054 - Psyduck
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 055 - Golduck
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: Does not appear
 * 079 - Slowpoke
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 086 - Seel
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 090 - Shellder
 * Pokémon Red: 19% encounter rate
 * Pokémon Blue: Does not appear
 * 098 - Krabby
 * Pokémon Red: Does not appear
 * Pokémon Blue: 20% encounter rate
 * 116 - Horsea
 * Pokémon Red: 20% encounter rate
 * Pokémon Blue: Does not appear
 * 120 - Staryu
 * Pokémon Red: Does not appear
 * Pokémon Blue: 19% encounter rate
 * 054 - Psyduck
 * Pokémon Red: Does not appear
 * Pokémon Blue: 15% encounter rate
 * 079 - Slowpoke
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: Does not appear
 * 086 - Seel
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 087 - Dewgong
 * Pokémon Red: 4% encounter rate
 * Pokémon Blue: 4% encounter rate
 * 090 - Shellder
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 098 - Krabby
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate
 * 099 - Kingler
 * Pokémon Red: Does not appear
 * Pokémon Blue: 1% encounter rate
 * 116 - Horsea
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 117 - Seadra
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: Does not appear
 * 120 - Staryu
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 25% encounter rate

Basement 3 (anywhere)
 * 042 - Golbat
 * Pokémon Red: 4% encounter rate
 * Pokémon Blue: 4% encounter rate
 * 054 - Psyduck
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate
 * 055 - Golduck
 * Pokémon Red: Does not appear
 * Pokémon Blue: 1% encounter rate
 * 079 - Slowpoke
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 080 - Slowbro
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: Does not appear
 * 086 - Seel
 * Pokémon Red: 40% encounter rate
 * Pokémon Blue: 40% encounter rate
 * 090 - Shellder
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 10% encounter rate
 * 098 - Krabby
 * Pokémon Red: Does not appear
 * Pokémon Blue: 15% encounter rate
 * 116 - Horsea
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: Does not appear
 * 120 - Staryu
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 5% encounter rate

Basement 4 (anywhere)
 * 054 - Psyduck
 * Pokémon Red: Does not appear
 * Pokémon Blue: 40% encounter rate
 * 079 - Slowpoke
 * Pokémon Red: 40% encounter rate
 * Pokémon Blue: Does not appear
 * 086 - Seel
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 087 - Dewgong
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: 1% encounter rate
 * 090 - Shellder
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: Does not appear
 * 098 - Krabby
 * Pokémon Red: Does not appear
 * Pokémon Blue: 15% encounter rate
 * 099 - Kingler
 * Pokémon Red: Does not appear
 * Pokémon Blue: 4% encounter rate
 * 116 - Horsea
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: Does not appear
 * 117 - Seadra
 * Pokémon Red: 4$ encounter rate
 * Pokémon Blue: Does not appear
 * 120 - Staryu
 * Pokémon Red: Does not appear
 * Pokémon Blue: 15% encounter rate


 * 042 - Golbat
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: 1% encounter rate
 * 054 - Psyduck
 * Pokémon Red: Does not appear
 * Pokémon Blue: 15% encounter rate
 * 055 - Golduck
 * Pokémon Red: Does not appear
 * Pokémon Blue: 4% encounter rate
 * 079 - Slowpoke
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: Does not appear
 * 080 - Slowbro
 * Pokémon Red: 4% encounter rate
 * Pokémon Blue: Does not appear
 * 086 - Seel
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 090 - Shellder
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: Does not appear
 * 098 - Krabby
 * Pokémon Red: Does not appear
 * Pokémon Blue: 40% encounter rate
 * 116 - Horsea
 * Pokémon Red: 40% encounter rate
 * Pokémon Blue: Does not appear
 * 120 - Staryu
 * Pokémon Red: Does not appear
 * Pokémon Blue: 25% encounter rate

Unknown Dungeon
First floor (anywhere)

Second floor (anywhere)
 * 024 - Arbok
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: Does not appear
 * 026 - Raichu
 * Pokémon Red: 4% encounter rate
 * Pokémon Blue: 4% encounter rate
 * 028 - Sandshrew
 * Pokémon Red: Does not appear
 * Pokémon Blue: 10% encounter rate
 * 042 - Golbat
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 047 - Parasect
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 049 - Venomoth
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate
 * 064 - Kadabra
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 082 - Magniton
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 085 - Dodrio
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate
 * 097 - Hypno
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 132 - Ditto
 * Pokémon Red: 1% encounter rate
 * Pokémon Blue: 1% encounter rate

Basement (anywhere)
 * 040 - Wigglytuff
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 049 - Venomoth
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 064 - Kadabra
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 085 - Dodrio
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 105 - Marowak
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate
 * 112 - Rhydon
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate
 * 113 - Chansey
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 132 - Ditto
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate


 * 024 - Arbok
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: Does not appear
 * 026 - Raichu
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate
 * 028 - Sandslash
 * Pokémon Red: Does not appear
 * Pokémon Blue: 5% encounter rate
 * 047 - Parasect
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate
 * 101 - Electrode
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue: 15% encounter rate
 * 106 - Marowak
 * Pokémon Red: 15% encounter rate
 * Pokémon Blue 15% encounter rate
 * 112 - Rhydon
 * Pokémon Red: 25% encounter rate
 * Pokémon Blue: 25% encounter rate
 * 113 - Chansey
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate
 * 132 - Ditto
 * Pokémon Red: 10% encounter rate
 * Pokémon Blue: 10% encounter rate

Viridian City
Fishing with the Old Rod


 * 129 - Magikarp
 * Pokémon Red: 100% encounter rate
 * Pokémon Blue: 100% encounter rate

Fishing with the Super Rod


 * 060 - Poliwag
 * Pokémon Red: 50% encounter rate
 * Pokémon Blue: 50% encounter rate
 * 072 - Tentacool
 * Pokémon Red: 50% encounter rate

Viridian Forest
In the tall grass
 * 010 - Caterpie
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 50% encounter rate
 * 011 - Metapod
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 35% encounter rate
 * 013 - Weedle
 * Pokémon Red: 50% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 014 - Kakuna
 * Pokémon Red: 35% encounter rate
 * Pokémon Blue: 5% encounter rate
 * 025 - Pikachu
 * Pokémon Red: 5% encounter rate
 * Pokémon Blue: 5% encounter rate