A) Go right from Rustboro City and through the Rustboro Tunnel, then go to Mauville and then north. Get on the cable car and then head south to Lavaridge.
B) Surf north from Rustboro City and go through Meteor Falls. Then go past Fallabor Town and south through the Firey Path and on the Cable Car.
go to the front of the city, may/brendan should be standing around. you come near them and they ask to battle. then he'll say the guy you helped used to be a sailor, go to him and talk to him and he'll take you to an island. deliver the letter to the guy in the cave and beat the gym leader. then you can go to slateport and deliver the devon goods. Hope i helped :)
Near the petalburg woods is a house here lives Mr Briney he can take you on his ship to dewford city but only after you save his beloved pal Wingull in Rusturf Tunnel which is found east of Rustboro City.
mr briney is at slateport helping the people make the ship
u have 2 beat your dad ( gym leader) then a guy walks in and takes u 2 his house and gives u surf but beware, he's petalburg's gym leader(5th).
why would anything happen to him? i think he/she means mr briney.
Go to cave near rustboro and find mr briney who will sail you to dewford where you deliver the letter
Sail with Mr. Briney to Dewford Town.
Out side of petalburg woods
dewford and slateport
After beating the gymnasium in Rustboro city, go to the upper right corner of the city. Go further and you will see Mr. Briney outside the tunnel waiting for Team Aqua and his Peeko to get outside. After beating the Team Aqua inside, go out and Mr. Briney will talk to you. After this small conversation, go to the Devon Factory (located on the left side of the gym part) and the stairs is ow unblocked. Go to the third floor and the Devon President will give you a task and the Pok
The second gym is in dewford town. Sail with mr. Briney to get there.
It's a pretty hard to find area, but here are the directions to get there! Go up from Rustboro City until you get to the area where Mr. Briney's cottage is. Surf straight up. Then go up again and surf through the rocks. This is where you'll find Jigglypuff. You have to evolve it with a Moon Stone, though.
slatepot and dewford Also, there is another pace, but I cannot recall...
if you just beat flannery and are still in lavaridge then go back through fiery path and go to the jagged pass go through it and go to the right down the ledges then go right and down and you'll be in mauville then you can just go to slateport (Via Cycling road) and take mr. briney to dewford and then to petalburg
if you haven't already delivered the letter to steven then go to slateport city by talking to mr briney on the pier if not then go to the cave beind the trees and go in and get to steven and talk to him then go to mr briney
You need to use mr briney's ship to reach slateport city then go north to reach mauville city.
go west out of petalburg city and head north at the split. the entrance is above mr. briney's cottage