you get to see there boss wake groudon
after getting into team magmas hideout
you have to catch groundon
a master ball
it is at mt chimney
AT THE UNDER WATER CAVE A.K.A.TEAM MAGMAS HIDEOUT
north east of lilycove
You go to mt chimny and then a rock will shak and resemble a hole and that's team magmas hideout . But I think you need a mechamp to get in.
On the southwest of Charpos Island
The final hideout is between Sootopoolis and Mossdeep. Use dive when you see the sub.
you can catch one in team magmas hideout
After you got the magma emblem, go to jagged pass. It will be there...
You r suppose to find groudon and battle maxie