i think you need the cheat for the ghost if you have the computer game boy?
No, after you get a gym Badge from Roxanne You should go talk to a person and go to the rusturf tunnel and fight team aqa then go back to Route 204 MR.BRINEY'S COTTAGE and MR.BRINEY will be chacing a Pokemon catch him and talk to him. He will take you across the water to Dewford town give the letter to someone i forgot who:).you talk to a guy near the rest house before the rusturf tunnel entrance.
in rusturf city
Skitty does not appear in Rusturf Tunnel. Only Whismur are there.
East of Rustboro City.
Strength, you get that HM from a karate guy in rusturf tunnel he gives you it after using rock smash to help him get through the tunnel.
in the grass between rustboro city and the rusturf tunnel
There's no Ventredurf tunnel - Right name is Rusturf tunnel, which links Rustboro and Verdanturf.
You can find it Rustro mart, Rusturf tunnel, trick house (in some marts. I think in the elite four pokemon center) Rustboro Mart, Rusturf Tunnel, Trick House
Rusturf Tunnel is located east from Rustboro City you can also enter the cave from Verandturf Town.
Its a tunnel that connects the route east of rustboro city with verandturf town.
You can go through Rusturf Tunnel,then You will end up at Route 116.After that go to RustBoro city and through Petalburg Woods
it is where you go to get that man's wingull back and where those people are that are the couple