After this, you surf from sootopolis or thereabouts, to ever grande city in the east. Once there, make your way through victory road, and then the Pokemon league after that
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you go to Petalburg city gym to get your fourth bage and surf
Go to petalburg then walk into the gym its simple!
Go in. Beat the GYM. THAT SIMPLE
go to slaport :)
Go to Mawille(eletric gym town) and there will be a gym leader... there is no gym leader