first you go the man outside of petalburg city then he will drive you to dewford then go to stephen in the granite cave then ask the man again and he will drive you to slateport
Talk to the old guy who brought u to dewford..and he will ask u whether u wanna go to slateport..say yes..then clean up the mess in slateport and then go north to mauville..
dewford and slateport
u go to the biggest building and then old man will give u letter go to dewford in cave and then slateport
Between Dewford and Slateport cities.
you sail with mr briney, to dewford, deliver the letter and beet the gym, then sail to slateport.
NO WAY BUT U GET SLATEPORT AND DEWFORD AS GOOD
Use the boat with mr. briney to the left of petalburg to get to dewford. Then, after you deliver the package for the devon people in the cave, you can boat again to slateport.
If you look on your pokenav its the city in the middle of the map its a long red bar. To get there you need to go to Slateport city from dewford town then go north.
You have to beat the Dewford Gym then go in the museum in Slateport where there was a long line of Team Aqua, he's on the second floor.
There is no Abandoned Ship on Diamond. There is one, but only on Emerald in between Dewford and Slateport.
Type your answer here... go to the ship near dewford and find a device then give it to a reasercher at the top of the ship and go to the guy at the ferry place in slateport and ask him to give you the seatooth
It is between the water route of dewford town to slateport city(somewhere in route 107,108 and 109).HOPE THIS HELPS.............