How do you get the mystery part in Pokemon Mystery Dungeon explorer of time?

You can't get the "Mystery Part" in Pokémon Mystery Dungeon: Explorers of Time. There is no item with that name in the game.

It's possible you're thinking of a different item or a different game.

To help me understand what you're looking for, please tell me:

* What do you think the "Mystery Part" does?

* Where did you hear about the "Mystery Part"?

With more information, I can give you a better answer!