If you were looking for the Keys from the Unova Link, see Key System.
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A key to open a red door. It disappears once you open a door.
List of items found in chambers
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.