From Bulbapedia, the community-driven Pokémon encyclopedia.
The Luminous Spring (Japanese: ひかりのいずみ Spring of Light) is a cave in Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness and Pokémon Mystery Dungeon: Explorers of Sky where the player can evolve Pokémon.
Luminous Spring is unlocked after defeating the guild members in Mystifying Forest. During much of the game, Luminous Spring can not evolve Pokémon due to time being distorted. However, after graduating from Wigglytuff's Guild, Teddiursa, Ursaring, the player, and their partner rediscover it, and Teddiursa evolves into an Ursaring. The partner tries to evolve too, but the player cannot evolve the starter or partner due to distortion which prohibits them from evolving until Manaphy has told them about Marine ResortS and Palkia has been recruitedTD.
After defeating the guild members, Luminous Spring is not accessed through Mystifying Forest, but can be accessed directly through the dungeon selection menu.
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