A key that unlocks a door inside a dungeon. Before you use a Key, be sure to stand before a door and face it directly.
Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team
In Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team, the Key is used to open chambers appearing on set floors of certain dungeons in order to gain rare items that are usually otherwise unobtainable, such as HMs, Friend Bows and Wish Stones. It is consumed after use.
Pokémon Mystery Dungeon: Explorers or Time, Explorers of Darkness, and Explorers of Sky
In Pokémon Mystery Dungeon: Explorers of Time, Explorers of Darkness, and Explorers of Sky, Keys are used to open chambers that randomly appear in dungeons when not on a mission.
In Pokémon Mystery Dungeon: Gates to Infinity, Keys unlock doors for detours, which hold Deluxe Boxes, special enemies, and special tiles. All Keys may be sold at the Kecleon Shop for 165 Poké.
How to obtain
Blue Keys, Red Keys, Black Keys, and Green Keys may be obtained through passwords or as prizes for missions. A Black Key is obtained from a treasure chest in the Glacier Palace dungeon. Keys can also be obtained by trading Gold Bars with Cofagrigus or by ranking up.