Cerulean Cave

Cerulean Cave, also called the Unknown Dungeon, is home to high-level wild Pokémon. Only trainers who compete and win in the Pokémon League at Indigo Plateau may enter.

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UD 1F - Red/Green(JP)

File:UnknownDungeon - Green Version 2.png

UD 2F - Red/Green(JP)

File:UnknownDungeon - Green Version 3.PNG

UD B1 - Red/Green(JP)

File:UnknownDungeon - Blue Version 1.gif

UD 1F - Red/Blue(US), Blue(JP)

File:UnknownDungeon - Blue Version 2.gif

UD 2F - Red/Blue(US), Blue(JP)

File:UnknownDungeon - Blue Version 3.gif

UD B1 - Red/Blue(US), Blue(JP)

File:UnknownDungeon - Yellow Version 1.gif

UD 1F - Yellow

File:UnknownDungeon - Yellow Version 2.gif

UD 2F - Yellow

File:UnknownDungeon - Yellow Version 3.gif

UD B1 - Yellow

The Unknown Dungeon has had many different layouts, getting a change from one game release to the next. In Pokémon FireRed and LeafGreen, the layout is true to that of the original Red/Green games, asides from the addition of Rock Smash boulders.

Another addition in FireRed/LeafGreen lies in the fact that trainers are now required to further prove themselves before entering the cave, which is done by completing the quest on Sevii Islands and bringing the Network Machine to operate.

Pokémon that Appear in Cerulean Cave

Pokémon Red/Blue(US), Red/Green(JP), Blue(JP)

Arbok (Red only)
Chansey
Clefable (Japanese Blue only)
Ditto
Dodrio
Electrode
Golbat
Hypno
Kadabra
Magneton
Marowak
Parasect
Raichu
Raticate (Japanese Blue only)
Rhydon
Sandslash (American Blue, Japanese Green and Japanese Blue only)
Venomoth
Wigglytuff

Pokémon Yellow

Pokémon FireRed/LeafGreen

Ditto
Electrode
Golbat
Kadabra
Machoke
Magneton
Parasect
Primeape
Wobbuffet
Psyduck (Surf, Fishing, FireRed only)
Golduck (Surf, Fishing, FireRed only)
Slowpoke (Surf, LeafGreen only)
Slowbro (Surf, LeafGreen only)
Geodude (Rock Smash)
Graveler (Rock Smash)
Magikarp (Fishing)
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Poliwhirl (Fishing)
Goldeen (Fishing)
Gyarados (Fishing)