After you get the seventh badge, you should fly to Oreburg city and use your bike to get up the mud slide. go in the cave to your right. and there should be water to surf on. surf over that and use rock clime. after that it is pretty strait foward untill you get to the spear pillar and go into the distortion world
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GET THE LAST BADGE......
You have to have a badge. Then go to Jubilife City.
you go to the lake to battle team galatic and then you go to snowpoint city to get your seventh badge.
go to pallet town and swim down to cinabar island and get the key in the mansion and go the gym and unlock the door and there you go
you go to deep down in mont coronet i think after you beat the seventh gym