Unknown Dungeon (Kalos)

050Diglett.png This article is incomplete.
Please feel free to edit this article to add missing information and complete it.
Reason: Missing layout

Unknown Dungeon ななしの洞窟
Nameless Cave
"Wild Missingno. appeared!"
Unknown Dungeon XY.png
Map description: {{{mapdesc}}}
Location: Pokémon Village
Region: Kalos
Generations: VI
Kalos Pokémon Village Map.png
Location of Unknown Dungeon in Kalos.
Pokémon world locations

The Unknown Dungeon (Japanese: ななしの洞窟 Nameless Cave) is a very small cave in southern Kalos that can be accessed from Pokémon Village. A sole Mewtwo resides in the center with either the Mewtwonite XX or Mewtwonite YY. The Unknown Dungeon is only accessible to Trainers who enter the Hall of Fame. Surf is needed to access the cave.

Its purpose as a place to catch Mewtwo is a direct reference to Cerulean Cave in Kanto. It also shares its name with the alternative moniker for Cerulean Cave used in Japanese releases of the Generation I games.


The Unknown Dungeon is a tiny cave whose entrance is found in the side of a mountain. The cave is barren in terms of terrain aside from the occasional water drop and the few rocks that dot the floor. Mewtwo awaits the player in the center of the cave, facing away from the entrance.


Item Location Games
  Oval Stone On the small stalagmite in the northwest of the cave (hidden, reappears occasionally)  X  Y 
  Mewtwonite X Automatically obtained after capturing Mewtwo  X 
  Mewtwonite Y Automatically obtained after capturing Mewtwo  Y 

Natural objects

Item Location Games
  Hard Stone Randomly found by using Hyper Voice or Rock Slide on a spiky rock during a battle  X  Y 
  Float Stone Randomly found by using Hyper Voice or Rock Slide on a spiky rock during a battle  X  Y 
  Damp Rock Found by using Muddy Water, Surf, or Water Spout on a thin rock during a battle  X  Y 

Special encounters

A Mewtwo appears here on the first visit. If defeated or run from, it respawns after entering the Hall of Fame. It is coded to never be Shiny. After being caught, it will leave behind its Mewtwonite XX or Mewtwonite YY, depending on the game.

Psychic Unknown
Held item:
Mewtwo Lv.70
Normal Status
Psychic Special
Psychic Status
Aura Sphere
Fighting Special

In the manga

The Unknown Dungeon in Pokémon Adventures

Pokémon Adventures

X & Y arc

The Unknown Dungeon appeared briefly in Malamar Traps, where Mewtwo was shown residing inside the cave, waiting to make its move against Team Flare.

In other languages

Language Title
Chinese Cantonese 無名洞窟 Mòuhmìhng Duhngfāt
Mandarin 無名洞窟 / 无名洞窟 Wúmíng Dòngkū
  French Grotte Inconnue
  German Geheimdungeon
  Italian Grotta Ignota
  Korean 이름없는 동굴 Ireum-eomneun Donggul
  Spanish Mazmorra Rara

Game locations of Legendary and Mythical Pokémon
Kanto Seafoam IslandsPower PlantVictory RoadCerulean Cave
Route 10Route 25Pewter CityRoaming Pokémon
Sevii Islands Mt. EmberNavel RockBirth Island
Johto Ilex ForestBell TowerWhirl IslandsMt. Silver Cave
Burned TowerEmbedded TowerRoaming Pokémon
Hoenn Desert RuinsIsland CaveAncient TombCave of OriginMarine Cave
Terra CaveSky PillarSouthern IslandSea MauvilleScorched Slab
Pathless PlainNameless CavernFabled CaveGnarled Den
Trackless ForestCrescent IsleSkyRoaming Pokémon
Sinnoh Acuity CavernValor CavernSpear PillarTurnback Cave
Rock Peak RuinsIceberg RuinsIron RuinsSnowpoint Temple
Stark MountainNewmoon IslandFlower ParadiseHall of Origin
Ramanas ParkFloaroma TownRoaming Pokémon
Unova Guidance ChamberTrial ChamberRumination FieldN's CastleAbundant Shrine
Giant ChasmDragonspiral TowerLiberty GardenRoute 11Route 13Route 22
Route 23Celestial TowerNacrene CityUnderground RuinsTwist Mountain
DreamyardMarvelous BridgeReversal MountainCoastal BiomeRoaming Pokémon
Kalos Sea Spirit's DenTeam Flare Secret HQTerminus Cave
Unknown DungeonRoaming Pokémon
Alola Route 16Altar of the SunneAltar of the MooneMount LanakilaMahalo Trail
Ruins of ConflictRuins of LifeRuins of AbundanceRuins of Hope
Aether ParadiseAncient Poni PathLake of the SunneLake of the Moone
Ten Carat HillResolution Cave
Galar Tower summitBattle TowerMaster DojoCrown ShrineMax Lair
Rock Peak RuinsIceberg RuinsIron RuinsSplit-Decision RuinsGiant's Bed
Frigid SeaLakeside CaveBallimere LakeFreezingtonRoaming Pokémon
Hisui Seaside HollowTemple of SinnohAcuity CavernValor CavernVerity Cavern
Lava Dome SanctumMoonview ArenaSnowpoint TempleTurnback CaveBonechill Wastes
Cobalt CoastlandsRamanas IslandScarlet BogCoronet HighlandsFloaro Gardens
Paldea Grasswither ShrineIcerend ShrineGroundblight ShrineFirescourge Shrine
Poco PathArea ZeroArea Zero UnderdepthsGlaseado Mountain
South Province (Area One)Asado DesertWest Province (Area One)East Province (Area Three)
Casseroya LakeNorth Paldean SeaSouth Province (Area Four)North Province (Area Two)
Alfornada CavernGreat Crater of PaldeaTagtree ThicketEast Province (Area One)
South Province (Area Five)Dalizapa PassagePokémon LeagueSocarrat Trail
Kitakami Paradise BarrensWistful FieldsOni MountainDreaded DenLoyalty Plaza
Other Faraway IslandDistortion WorldSinjoh RuinsUltra Space Wilds

Vaniville TownAquacorde Town‎Santalune CityLumiose CityCamphrier TownCyllage City
Ambrette TownGeosenge TownShalour CityCoumarine CityLaverre CityDendemille TownAnistar City
Couriway TownSnowbelle CityPokémon LeagueKiloude City‎
Santalune ForestChamber of EmptinessParfum PalaceBattle ChateauBerry fieldsConnecting CaveGlittering CaveReflection Cave
Tower of MasteryAzure BaySea Spirit's DenKalos Power PlantPoké Ball FactoryLost HotelFrost CavernLysandre Labs
Team Flare Secret HQTerminus CavePokémon VillageVictory RoadBattle MaisonFriend SafariUnknown Dungeon

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