Luminous Cave
From Bulbapedia, the community-driven Pokémon encyclopedia.
Luminous Cave is a Mysterious Cave which appears in Pokémon Mystery Dungeon. The cave is filled with a mysterious light that speaks to whoever enters. It is used to evolve Pokemon in the game when they enter the cave
In Game Information
The cave is unlocked after the player defeats Rayquaza at the Sky Pillar. It is discovered by Snubbull who evolves into Granbull. The cave is oddly tiny as only one Pokemon at a time may enter. This caused many gamers grief as they had to keep switching their lead Pokemon. This problem was fixed in the sequel in which the player could evolve any Pokemon at any given time. Also the cave was changed and renamed Luminous Spring.