go to amp plains f4 and you encounter zapdos
You DO NOT USE the MYSTERY PART OR SECRET SLAB. You keep it in the bag for it to be able to do what it does.
you don't activate the secret slab the purpose of the secret slab is to summon legendaries in certain dungeons
19th floor of happy outlook
Obtain a mission that allows or has a reward that involves getting a secret slab.
The Secret Slab takes effect after Manaphy is recruited and the Marine Resort opens up. It causes legendaries to appear in preset locations.
the secret slab lets you find certain legendary Pokemon in cetain floors of a dungeon. for example, with a secret slab you can find darkrai on floor 3 of the miracle sea.
The secret slab enables you to meet legendary Pokemon after you reach the marine resort.
You can get a secret slab again but you can't use the same wonder mail, you need another one. It is possible to find another code if it is at least your first slab. If not, continue looking everyday at Wigglytuff Guild and can be lucky. It should say "Let's look for the Secret Slab!" and finish it. Forget the reward and look for this title. Source: LV 100 Charizard with all the legendary Pokemon except Celebi because I have Darkness, in my team. Ways to not lose your slab, before going to a dungeon with it, save. You also don't need to hold it so you don't need to worry a Trip Trap Underfoot. You must not Select "Use" on the Secret Slab options. If the Secret Slab does not work it means the recruit rate is low. Recommend using the Golden Mask.
i indeed did get celebi once getting secret slab and it will be a shiny celebi
sometimes on a mission, it will say to explore with the client to find a secret slab, so when you complete the job you get to keep the secret slab or you can just put in wondermail codes to obtain it.
look it up on google ("pokemon explorers of darkness secret slab") and enter it on the main menu
beat dialga to get to mystifying forest. 2 get a secret slab go to apointlessplace.net and you can make your own wondermail.