First you have to deafeat Team Magma In Mount Chimney. Then go to slateport city to the dock building where you run into team aqua stealing a submarine, then you go to Lilycove and enter Shoal Cave. The two Team Aqua Grunts won't be there any more so you can pass through. Fight all of Team Aqua and The person Team Aqua Grunt that was training will not be there any more so you can surf past them. Keep Surfing until you get to Mossdeep and Mossdeep is a Diffrent Story.
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mossdeep city
Sootopolis city.
Underwater around sootopolis city and mossdeep city
I think he is near or in Mossdeep City.
The super rod is received in mossdeep city.