Its in sootopolis city. an old guy stands in front of it saying "itys to peaceful to go in. but, whern you go to the under sea cove,where team magma finds groudon, you haft to battle there leader. once hes defeated, he uses the blue orb, but groudon teloports to the cave of origin. then you have to go in and find ground, use the red orb the old lady at mt. pyere gave you. and cature groudon.