to the 8th gym :p but seriosly i think u go to stooplis meaning u have to go under water about west form mosdeep
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use dive in the dark water then go into a cave. ue dive again and you should be in sootapolis city
You have to go to mossdeep city and battle the gym leaders, there are 2 of them in a double battle. Your Pokemon should be on level 50 or more before you challenge them though, because they are tough.
beat the 2nd gym and go in the cave
Go on to defeat the seventh gym in Mossdeep City, if you did not already catch Kyogre.
get the key in the od mansion on cinabargo to cinnibar island, then go in that place next to the gym and look for secret key. then get out and then you can go in the gym in cinabar island