Unknown Dungeon is a cave in Kalos. It can only be accessed once the Pokémon League has been defeated.
To reach Unknown Dungeon, one must travel through Route 20 to the Pokémon Village and bring a Pokémon who knows Surf. The entrance is located behind a ledge and can be accessed from the surfable river.
Unknown Dungeon is a quiet, small cave. From the entrance in Pokémon Village, the cave starts with a short path that leads to a small chamber where Mewtwo awaits.
| Held item:|
|Mewtwonite X||X||After defeating/capturing Mewtwo|
|Mewtwonite Y||Y||After defeating/capturing Mewtwo|
|Oval Stone||X/Y||Northwest of the cave (hidden, reappars occasionally)|
|Float Stone||X/Y||Obtained by using Hyper Voice or Rock Slide when a brown rock is present in the background|
|Hard Stone||X/Y||Obtained by using Hyper Voice or Rock Slide when a brown rock is present in the background|
|Damp Rock||X/Y||Obtained by using Muddy Water, Surf or Water Spout when a grey rock is present in the background|
Towns and Villages
1 (Vaniville Pathway) · 2 (Avance Trail) · 3 (Ouvert Way) · 4 (Parterre Way) · 5 (Versant Road) · 6 (Palais Lane)
7 (Rivière Walk) · 8 (Muraille Coast) · 9 (Spikes Passage) · 10 (Menhir Trail) · 11 (Miroir Way) · 12 (Fourrage Road)
13 (Lumiose Badlands) · 14 (Laverre Nature Trail) · 15 (Brun Way) · 16 (Mélancolie Path) · 17 (Mamoswine Road)
18 (Vallée Étroite Way) · 19 (Grande Vallée Way) · 20 (Winding Woods) · 21 (Dernière Way) · 22 (Détourner Way)
Places of Interest
|Other regions: Kanto (Sevii Islands) · Johto · Hoenn · Sinnoh (Battle Zone) · Unova · Kalos · Alola · Galar (Isle of Armor · Crown Tundra)|