go to mount pryre.
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Go to the top of Mt. Pyre summit and you will discover Maxie/Archie already took the Orb that was upon the summit. The elderly man will give you the Magma Emblem to open Team Magma's hideout.
the man on mnt. pyere gives it to you af ter you beat them on mnt. pyere
i don't know but i remember that you can access the Magma Cave/Hideout in order to battle Maxie / or even not. I think after you defeat Maxie, it is closed. But i Already Finished Pokemon Emerald..
Go to Jagged Pass and go in the middle where the Magma guy was. There is an earthquake and a door appears.
go to the cable car at 112.go down the hill to jagged pass.the magma amulet shakes.a cave opens up.go in the cave.and you in team magma hideout.so now you know what to do