you usually go to the elite four and face them witch is right above sunnyshore city will have to know surf and waterfall to get there) and after you beat them you go to the survival area, battle park and the resort area.
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Go on to defeat the seventh gym in Mossdeep City, if you did not already catch Kyogre.
i go to the PC
go to the desert get the fossil and then go to petalburg city and defeat the gym there
you go back to olivine
there isn't a 17th gym you idiot! 8+8=16! there's only Red to defeat...and he is hard. lvl 88 pikachu...