When you learn to use the force.
In Slateport and in Lilycove
in slateport Dummy
In Slateport City, to the left of the Pokemon center.
Slateport in front of the contest place
the third badge in sapphire is at mauville city(north of slateport city)
You can from the ferry in slateport or the other one with a ferryboat dock after they're beaten.
In Slateport and in Lilycove
in slateport Dummy
Slateport city.
Go back to Slateport town. Inside the ferry building, you will find captain stern and the submarine being robbed by Team Aqua.
The Name Rater is in Slateport City, in the building to the left of the Pokemon Center.
Like ruby and sapphire, it is north of slateport city, south of mauville city. Easier to reach from slateport city.
pay 50 money to get in.
slateport city Pokemon mart
In Slateport City, to the left of the Pokemon center.
its in slateport below the Pokemon contest buliding
Slateport in front of the contest place