Once you beat Norman in Petalburg Gym, you should be able to receive HM03 (Surf) from Wally's parents in the same city. This will let you cross the water on Route 118, enabling you to continue on through Route 119 to Fortree and onward. You will also end up making a stop at the Weather Institute in Route 119 for an encounter with Team Magma/Aqua.
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Go to Viridian city and beat Giovanni,the gym leader
you go in any order the who have to go across the see vs the fire gym leader them go to oak
After beating the 2nd gym leader you need to see steven in the cave in dewford town if you have not already if you already talked to steven then talk to mr briney and go to slateport city from here go north to mauville city and beat the 3rd gym leader there.
Beat the Elite 4. Surf East of the last city and go up the waterfallll.
u go 2 petalburg city after beating flannery the gym leader of laviridge beat Norman the gym leader of petalburg and ur father and then go 2 wallys house next 2 the gym wally's father will give u surf