maybe you can get the secret slab and mystery part in your treasure bag
it is PXJ634F44Q3FQW&KYRX538+=
First you need a mystery part or enigma part. Then go to mystery jungle at BF13. Celebi will be there.
You can get them from random missions.
How about a conundrum? Or an enigma.
mystery
they are the same item. the enigma part is also called the mystery part. the mystery part and the secret slab do the same thing.
It is in Final Maze 40F you need secret stone plate or enigma part in bag (secret slab or mystery part)
amp plains 7F. but you will need mystery part-enigma part. get it on link http://upokecenter.com/games/dungeon2/guides/wondermail.php
enigma, conundrum
"An enigma wrapped in mystery and riddled with controversy" is how UFO's have been described. He/she is an enigma. The location of 'The Lost Dutchman' gold mine remains an enigma.
enigma
Mystery