They help you recruit all the legendaries.
he is in amp pains if you have a secret slab and a mystery part
concealed ruins with secret slab or mystery part
Recruit from Dark Crater or Mystery Part or Secret Slab
You get it by doing lots of missions. Then, you get it from a Elekid.
You must have a Secret Slab/Mystery Part. He is in Dark Crater, 10F.
It is in Final Maze 40F you need secret stone plate or enigma part in bag (secret slab or mystery part)
zapdos is in amp plains on 7F but you need a mystery part or a secret slab
yes,b18f
You can find it in Surrounding Sea floor 18 with the Secret Slab or Mystery Part in your treasure.
you do a misson with umberon
When I found him he was in Sky Stiarway 7F. He could remove but he is in Sky Stiaway. You don't need a Secret Slab or a Mystery Part.
get either the mystery part or secret slab, then take one of them with you to Concealed Ruins (I think). Raikou will appear on the 20th floor.