Cerulean Cave

Cerulean Cave Unknown Dungeon ハナダのどうくつ Hanada Cave "Wild Missingno. appeared!"
Map description:	{{{mapdesc}}}
Location:	Cerulean City
Region:	Kanto
Generations:	I, III, IV
Location of Cerulean Cave in Kanto.
Pokémon world locations

Cerulean Cave (Japanese: ハナダのどうくつ Hanada Cave), sometimes referred to as the Unknown Dungeon (Japanese: ななしのどうくつ Nameless Cave) in Generation I, is a cave located in the northwest corner of Cerulean City in Kanto. The cave is home to a wide variety of high-level wild Pokémon. Only Trainers who compete and win in the Pokémon League at Indigo Plateau may enter, due to the potency of the Pokémon in the cave. At the end of the cave lies Mewtwo, the only one of its species in the game.

Cerulean Cave has had many different layouts over time, getting a change from not only one Generation to the next, but also from one game release to the next. In FireRed and LeafGreen, the layout is true to that of the original Red and Green games, aside from the addition of Rock Smash boulders.

Another addition in FireRed and 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 restoring the Network Machine to operational status. Another change is in the fact that more Pokémon can be found only by fishing, while wild Pokémon found just by walking around in the cave are reduced in number. In Generation I, there are also several species that make no sense to be in the cave, such as Dodrio and Pokémon that are otherwise only obtainable by stone-induced evolution; however, this has been fixed in Generation III, at the cost of some of the wild Pokémon diversity.

In Generation II, Cerulean Cave completely collapsed. However, the leftovers of Mewtwo's presence can still be found in the lake near the cave, in the form of the item Berserk Gene.

In Pokémon HeartGold and SoulSilver, Cerulean Cave has been rebuilt and Mewtwo can once again be found inside, although, as in previous generations, a person stands in the way until the player has proven him or herself by defeating all eight Kanto Gym Leaders.

CERULEAN CAVE
A mysterious cave that is filled
with terribly tough POKéMON.
It is so dangerous, the POKéMON
LEAGUE is in charge of it.

Geography

Misty entrance to Cerulean Cave

Cerulean Cave is a large underground complex of maze-like tunnels which extend out from Cerulean City to the mountains beyond. With the misty, dark entrance positioned on the outskirts of Cerulean City, only to be accessed by surfing down Route 24 to the entrance near the northern border of Cerulean City, the cave has been renowned for its mystery. The entrance to the cave looks like it has been carved out from a hillside, forming an indented mouth into the hill. A thick layer of mist surrounds the area and silhouettes of dark trees can be seen in the background. An Ace Trainer guards the mouth of the cave and only allows powerful Trainers who own all eight Gym Badges and have competed in and won the Pokémon League beating the Elite Four to enter its premises.

It is unknown whether Cerulean Cave was formed naturally through the process of weathering, built by man through the use of excavation, or perhaps by the Pokémon Mewtwo, which is the cave's most powerful resident; however, it is most likely formed by natural means. Pictures of the cave suggest it is a solutional cave, which was formed in the soluble rock, limestone, which is dissolved by natural acid in groundwater that seeps through the rock, forming the cave systems. Because of this, stalactites and stalagmites have formed in the cave while water rises from the floor and drips from the ceiling.

Encountering Mewtwo at the end of the tunnel

Because of its damp and dark environment, Cerulean Cave hosts a large array of different Pokémon well and truly beyond average levels. These Pokémon have possibly gained this amount of experience from living in an area uninhabited by humans, adapting to their environment. Pokémon such as Golbat and Venomoth are able to see their way through the darkness, while other powerful Pokémon like Hypno and Rhydon live in their habitat. All the Pokémon inhabiting Cerulean Cave have levels well over 40 and 50, with some even rising as high as 60, which is why the cave was sealed off and is forbidden to be entered unless Trainers own all eight Gym Badges and have competed in and won the Pokémon League, beating the Elite Four. At the deepest point of the cave lives Mewtwo, a Pokémon that can only be found in Cerulean Cave alone. Mewtwo was created by man in the Pokémon Mansion before it became too powerful and escaped, destroying the Mansion and exiling itself to the cave, never to be seen again. If Mewtwo had created Cerulean Cave as a residence during this event, the cave would have been recently formed – according to the Pokémon Mansion journals, Mewtwo had escaped the Pokémon Mansion only recently.

Cerulean Cave has had many different layouts over time, getting a change from not only one generation to the next, but also from one game release to the next. In FireRed and LeafGreen, the layout is true to that of the original Red and Green games, aside from the addition of Rock Smash boulders. However, besides these changes, the first floor has a large underground lake which covers most of the area. Using the complex of stairs and ladders, Trainers can make their way around the lake and the first floor of the cave. They will reach the upper floor, which has no underground river, but a like maze-like structure formed by large boulders and rocks that must be maneuvered around in order to reach the end. Once Trainers get through the maze formation, they are able to climb the ladders and get around the underground lake on the basement floor, which will lead them straight to a dead end and to Mewtwo.

Items

Item		Location	Games

Rock Smash

Item		Location	Games

Pokémon

Generation I

1F

Pokémon Games Location Levels Rate Golbat R B Y Cave 46 25% Golbat R B Y Cave 50-55 40% Magneton R B Y Cave 46 15% Hypno R B Y Cave 46 15% Graveler R B Y Cave 45 15% Arbok R B Y Cave 52 10% Sandslash R B Y Cave 52 10% Venomoth R B Y Cave 49 10% Venomoth R B Y Cave 54 5% Dodrio R B Y Cave 49 10% Gloom R B Y Cave 55 10% Weepinbell R B Y Cave 55 10% Parasect R B Y Cave 52 5% Parasect R B Y Cave 54 5% Kadabra R B Y Cave 49 5% Raichu R B Y Cave 53 4% Ditto R B Y Cave 53 1% Ditto R B Y Cave 55-60 5% Fishing Magikarp R B Y Fishing Old Rod 5 100% Poliwag R B Y Fishing Good Rod 10 50% Goldeen R B Y Fishing Good Rod 10 50% Goldeen R B Y Fishing Super Rod 25 40% Slowbro R B Y Fishing Super Rod 23 25% Krabby R B Y Fishing Super Rod 23 25% Seadra R B Y Fishing Super Rod 23 25% Seaking R B Y Fishing Super Rod 23 25% Seaking R B Y Fishing Super Rod 35-55 60% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

2F

Pokémon Games Location Levels Rate Golbat R B Y Cave 52-57 40% Dodrio R B Y Cave 51 25% Venomoth R B Y Cave 51 15% Kadabra R B Y Cave 51 15% Graveler R B Y Cave 50 15% Electrode R B Y Cave 52 10% Marowak R B Y Cave 52 10% Rhydon R B Y Cave 52 10% Rhydon R B Y Cave 58-60 5% Sandslash R B Y Cave 56 10% Rhyhorn R B Y Cave 50 10% Wigglytuff R B Y Cave 54 5% Chansey R B Y Cave 56 5% Ditto R B Y Cave 55-60 5% Ditto R B Y Cave 60 10% Gloom R B Y Cave 58 5% Weepinbell R B Y Cave 58 5% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

B1F

Pokémon Games Location Levels Rate Golbat R B Y Cave 54-59 40% Rhydon R B Y Cave 55 25% Rhydon R B Y Cave 62 10% Electrode R B Y Cave 55 15% Marowak R B Y Cave 55 15% Graveler R B Y Cave 55 15% Raichu R B Y Cave 64 10% Parasect R B Y Cave 64 10% Chansey R B Y Cave 64 10% Chansey R B Y Cave 56 5% Ditto R B Y Cave 63-67 10% Ditto R B Y Cave 60-65 15% Rhyhorn R B Y Cave 52 10% Arbok R B Y Cave 57 5% Sandslash R B Y Cave 57 5% Lickitung R B Y Cave 50-55 5% Fishing Magikarp R B Y Fishing Old Rod 5 100% Poliwag R B Y Fishing Good Rod 10 50% Goldeen R B Y Fishing Good Rod 10 50% Goldeen R B Y Fishing Super Rod 25 40% Slowbro R B Y Fishing Super Rod 23 25% Krabby R B Y Fishing Super Rod 23 25% Seadra R B Y Fishing Super Rod 23 25% Seaking R B Y Fishing Super Rod 23 25% Seaking R B Y Fishing Super Rod 35-55 60% Special Pokémon Mewtwo R B Y Only one 70 One A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

Generation III

1F

Pokémon Games Location Levels Rate Parasect FR LG Cave 49-58 25% Magneton FR LG Cave 49 20% Golbat FR LG Cave 46-55 14% Primeape FR LG Cave 52-61 11% Ditto FR LG Cave 52-61 11% Machoke FR LG Cave 46 10% Electrode FR LG Cave 58 5% Wobbuffet FR LG Cave 55 4% Geodude FR LG Rock Smash 30-50 65% Graveler FR LG Rock Smash 40-55 35% Fishing and Surfing Psyduck FR LG Surfing 30-50 65% Slowpoke FR LG Surfing 30-50 65% Golduck FR LG Surfing 40-55 35% Slowbro FR LG Surfing 40-55 35% Magikarp FR LG Fishing Old Rod 5 100% Poliwag FR LG Fishing Good Rod 5-15 60% Goldeen FR LG Fishing Good Rod 5-15 20% Magikarp FR LG Fishing Good Rod 5-15 20% Poliwag FR LG Fishing Super Rod 15-25 40% Poliwhirl FR LG Fishing Super Rod 20-30 40% Gyarados FR LG Fishing Super Rod 15-25 15% Psyduck FR LG Fishing Super Rod 15-35 5% Slowpoke FR LG Fishing Super Rod 15-35 5% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

2F

Pokémon Games Location Levels Rate Golbat FR LG Cave 49-58 25% Machoke FR LG Cave 49 20% Parasect FR LG Cave 52-61 14% Kadabra FR LG Cave 55-64 11% Ditto FR LG Cave 55-64 11% Magneton FR LG Cave 52 10% Wobbuffet FR LG Cave 58 5% Electrode FR LG Cave 61 4% Geodude FR LG Rock Smash 30-50 65% Graveler FR LG Rock Smash 40-55 35% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

B1F

Pokémon Games Location Levels Rate Kadabra FR LG Cave 58-67 25% Ditto FR LG Cave 58-67 25% Parasect FR LG Cave 55-64 14% Golbat FR LG Cave 52-61 11% Machoke FR LG Cave 52 10% Magneton FR LG Cave 55 10% Electrode FR LG Cave 64 4% Wobbuffet FR LG Cave 61 1% Geodude FR LG Rock Smash 30-50 65% Graveler FR LG Rock Smash 40-55 35% Fishing and Surfing Psyduck FR LG Surfing 30-50 65% Slowpoke FR LG Surfing 30-50 65% Golduck FR LG Surfing 40-55 35% Slowbro FR LG Surfing 40-55 35% Magikarp FR LG Fishing Old Rod 5 100% Poliwag FR LG Fishing Good Rod 5-15 60% Goldeen FR LG Fishing Good Rod 5-15 20% Magikarp FR LG Fishing Good Rod 5-15 20% Poliwag FR LG Fishing Super Rod 15-25 40% Poliwhirl FR LG Fishing Super Rod 20-30 40% Gyarados FR LG Fishing Super Rod 15-25 15% Psyduck FR LG Fishing Super Rod 15-35 5% Slowpoke FR LG Fishing Super Rod 15-35 5% Special Pokémon Mewtwo FR LG Only one 70 One A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

Generation IV

1F

Pokémon Games Location Levels Rate Electrode HG SS Cave 40 5% Wobbuffet HG SS Cave 37 5% Machoke HG SS Cave 39-40 24% 24% 6% Parasect HG SS Cave 38 20% 20% 10% Primeape HG SS Cave 38-39 14% 14% 0% Primeape HG SS Cave 39 0% 0% 4% Persian HG SS Cave 38-39 14% 14% 0% Persian HG SS Cave 39 0% 0% 4% Magneton HG SS Cave 40 11% 11% 10% Ditto HG SS Cave 39-40 11% 11% 10% Golbat HG SS Cave 38 10% 10% 0% Golbat HG SS Cave 38-39 0% 0% 50% Geodude HG SS Rock Smash 23-23 ? Graveler HG SS Rock Smash 26-30 ? Fishing and Surfing Psyduck HG SS Surfing 35-40 90% Golduck HG SS Surfing 40 10% Magikarp HG SS Fishing Old Rod 10 100% Poliwag HG SS Fishing Good Rod 20 62% Goldeen HG SS Fishing Good Rod 20 33% Magikarp HG SS Fishing Good Rod 20 5% Poliwag HG SS Fishing Super Rod 40 60% Poliwhirl HG SS Fishing Super Rod 40 30% Gyarados HG SS Fishing Super Rod 40 10% Special Pokémon Makuhita HG SS Hoenn Sound 39-40 20% Absol HG SS Hoenn Sound 38 20% Chingling HG SS Sinnoh Sound 39-40 20% Bronzor HG SS Sinnoh Sound 38 20% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

2F

Pokémon Games Location Levels Rate Parasect HG SS Cave 40 20% Kadabra HG SS Cave 42 20% Magneton HG SS Cave 41 10% Ditto HG SS Cave 42 10% Electrode HG SS Cave 41 5% Wobbuffet HG SS Cave 42 5% Machoke HG SS Cave 39-42 20% 20% 0% Machoke HG SS Cave 39 0% 0% 10% Golbat HG SS Cave 41 10% 10% 0% Golbat HG SS Cave 41-42 0% 0% 20% Geodude HG SS Rock Smash ? ? Graveler HG SS Rock Smash ? ? Special Pokémon Makuhita HG SS Hoenn Sound 41-42 20% Absol HG SS Hoenn Sound 39-41 20% Chingling HG SS Sinnoh Sound 41-42 20% Bronzor HG SS Sinnoh Sound 39-41 20% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

B1F

Pokémon Games Location Levels Rate Parasect HG SS Cave 45-47 25% Kadabra HG SS Cave 46 20% Magneton HG SS Cave 45-47 15% Golbat HG SS Cave 47 10% Machoke HG SS Cave 45 10% Ditto HG SS Cave 45 10% Electrode HG SS Cave 46 5% Wobbuffet HG SS Cave 49 5% Geodude HG SS Rock Smash ? ? Graveler HG SS Rock Smash ? ? Fishing and Surfing Psyduck HG SS Surfing 35-40 90% Golduck HG SS Surfing 40 10% Magikarp HG SS Fishing Old Rod 10 100% Poliwag HG SS Fishing Good Rod 20 62% Goldeen HG SS Fishing Good Rod 20 33% Magikarp HG SS Fishing Good Rod 20 5% Poliwag HG SS Fishing Super Rod 40 60% Poliwhirl HG SS Fishing Super Rod 40 30% Gyarados HG SS Fishing Super Rod 40 10% Special Pokémon Mewtwo HG SS Only one 70 One Makuhita HG SS Hoenn Sound 45 20% Absol HG SS Hoenn Sound 45-47 20% Chingling HG SS Sinnoh Sound 45 20% Bronzor HG SS Sinnoh Sound 45-47 20% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

Layout

The layout of the cave has been tweaked several times in the past, particularly in Generation I; however, the layout depicted in FireRed and LeafGreen has been restored to that original layout found in Red and Green.

Version	1st floor	2nd floor	Basement
Red (Ja)
Green
Red
Blue
Yellow	File:UnknownDungeon - Yellow Version 1.gif	File:UnknownDungeon - Yellow Version 2.gif	File:UnknownDungeon - Yellow Version 3.gif
FireRed
LeafGreen
HeartGold
SoulSilver

Eyecatch

• 

  HGSS Morning (Ditto)

• 

  HGSS Day/Evening (Ditto)

• 

  HGSS Night (Magneton)

• 

  FRLG

Trivia

• In Generation I, the Unknown Dungeon is not listed as a Pokédex area. Therefore, any Pokémon that can only be found in the Unknown Dungeon is listed as "area unknown" in the Pokédex; however, this was fixed in Generation III. Whether this was intended, forgotten, or just a glitch is unknown.

In other languages

Language Title Mandarin Chinese 華藍洞窟 Huálán Dòngkū French Canada Grotte Inconnue (Generation I) Grotte Azurée (Generation II onwards) Europe Grotte Inconnue (Generation I) Grotte Azurée (Generation II onwards) German Geheimdungeon (Generation I) Azuria-Höhle (Generation II onwards) Italian Grotta Ignota (Generation I) Grotta Celeste (Generation II onwards) Korean 블루시티동굴 Blue City Donggul Spanish Latin America Mazmorra Rara (Generation I) Cueva Celeste (Generation II onwards) Spain Mazmorra Rara (Generation I) Cueva Celeste (Generation II onwards)

References

• Psypoke Psydex - Pokémon catch rates

Kanto
Settlements Pallet Town • Viridian City • Pewter City • Cerulean City • Vermilion City • Lavender Town Celadon City • Saffron City • Fuchsia City • Cinnabar Island • Indigo Plateau Routes 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 • 26 • 27 • 28 Landmarks Professor Oak's Laboratory • Viridian Forest • Diglett's Cave • Pewter Museum of Science • Mt. Moon (Square) • Cerulean Cave Underground Path (Kanto Routes 5–6) • Underground Path (Kanto Routes 7–8) • S.S. Anne • S.S. Aqua • Sea Cottage • Rock Tunnel Power Plant • Cycling Road/Pokémon Road • Team Rocket Hideout • Silph Co. • Magnet Train • Pokémon Tower • Safari Zone/Pal Park GO Park • Seafoam Islands • Pokémon Mansion • Cinnabar Lab • Pokémon League Reception Gate • Victory Road • Tohjo Falls Access to Sevii Islands • Johto

Game locations of Legendary and Mythical Pokémon

Kanto Seafoam Islands • Power Plant • Victory Road • Cerulean Cave Route 10 • Route 25 • Pewter City • Roaming Pokémon Sevii Islands Mt. Ember • Navel Rock • Birth Island Johto Ilex Forest • Bell Tower • Whirl Islands • Mt. Silver Cave Burned Tower • Embedded Tower • Roaming Pokémon Hoenn Desert Ruins • Island Cave • Ancient Tomb • Cave of Origin • Marine Cave Terra Cave • Sky Pillar • Southern Island • Sea Mauville • Scorched Slab Pathless Plain • Nameless Cavern • Fabled Cave • Gnarled Den Trackless Forest • Crescent Isle • Sky • Roaming Pokémon Sinnoh Acuity Cavern • Valor Cavern • Spear Pillar • Turnback Cave Rock Peak Ruins • Iceberg Ruins • Iron Ruins • Snowpoint Temple Stark Mountain • Newmoon Island • Flower Paradise • Hall of Origin Ramanas Park • Floaroma Town • Roaming Pokémon Unova Guidance Chamber • Trial Chamber • Rumination Field • N's Castle • Abundant Shrine Giant Chasm • Dragonspiral Tower • Liberty Garden • Route 11 • Route 13 • Route 22 Route 23 • Celestial Tower • Nacrene City • Underground Ruins • Twist Mountain Dreamyard • Marvelous Bridge • Reversal Mountain • Coastal Biome • Roaming Pokémon Kalos Sea Spirit's Den • Team Flare Secret HQ • Terminus Cave Unknown Dungeon • Roaming Pokémon Alola Route 16 • Altar of the Sunne • Altar of the Moone • Mount Lanakila • Mahalo Trail Ruins of Conflict • Ruins of Life • Ruins of Abundance • Ruins of Hope Aether Paradise • Ancient Poni Path • Lake of the Sunne • Lake of the Moone Ten Carat Hill • Resolution Cave Galar Tower summit • Battle Tower • Master Dojo • Crown Shrine • Max Lair Rock Peak Ruins • Iceberg Ruins • Iron Ruins • Split-Decision Ruins • Giant's Bed Frigid Sea • Lakeside Cave • Ballimere Lake • Freezington • Roaming Pokémon Hisui Seaside Hollow • Temple of Sinnoh • Acuity Cavern • Valor Cavern • Verity Cavern Lava Dome Sanctum • Moonview Arena • Snowpoint Temple • Turnback Cave • Bonechill Wastes Cobalt Coastlands • Ramanas Island • Scarlet Bog • Coronet Highlands • Floaro Gardens Paldea Grasswither Shrine • Icerend Shrine • Groundblight Shrine • Firescourge Shrine Poco Path • Area Zero • Area Zero Underdepths • Glaseado Mountain South Province (Area One) • Asado Desert • West Province (Area One) • East Province (Area Three) Casseroya Lake • North Paldean Sea • South Province (Area Four) • North Province (Area Two) Alfornada Cavern • Great Crater of Paldea • Tagtree Thicket • East Province (Area One) South Province (Area Five) • Dalizapa Passage • Pokémon League • Socarrat Trail Kitakami Paradise Barrens • Wistful Fields • Oni Mountain • Dreaded Den • Loyalty Plaza Other Faraway Island • Distortion World • Sinjoh Ruins • Ultra Space Wilds

This article is part of Project Locations, a Bulbapedia project that aims to write comprehensive articles on every location in the Pokémon world.