there are 5 the 5th one is new called Pokemon Mystery Dungeon explorers of the sky
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there in any
they are on the floors of higher leveled dungeons.
You find it randomly on dungeons with a lot of floors
in some dungeons there will be doors you use the key on the doors while facing them
It is an item that if you keep it in the treasure bag it will make the rate of Pokemon recruitment chances go up in dungeons.