a mystery part is like a secret slab. keep it in your treasure bag and certain mazes will have rare Pokemon e.g. zapdos.
Note: if you don't have this the Pokemon won't show up
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It is part of the mystery gifts
it lets you find extra legendary Pokemon in dungons
revelation
at the end you fight raikou but you need secret slab/mystery part to recruit him and then there's six deluxe boxes at the end at the end you fight raikou but you need secret slab/mystery part to recruit him and then there's six deluxe boxes at the end ----- at floor 20 (30 floors) theres raikou need secret slab or mystery part (as said above). at floor 29 there is a key room containing a chest with the item for either regirock ice steel or regigigas (but sometimes theres a wonder gummi in it instead)
On the top left, in the net, is the outline of a house. on the right part of the house is the chimney.