In the place where the SS tidal is.
In the Slateport museum.
Captain Stern is on the top floor of the museum in Slateport City.
Slateport city given to you by Captain Stern.
he is in the slateport harbor, right above the Pokemon center
In the slateport city boat dock place
a guy will ask u if u can deliver Devon goods to captain stern..captain stern is found in the museum of slateport(specifically 2nd floor).
Head to slateport city and go to the SS tidal captain stern will be nearby.
You go to slateport and you deliver the Devon goods to captain stern.
he's not in there! he's in slasport city his worker is in the abandoned ship and he asks you to find the generator or something i forgot then you have to find it and then you go talk to him and he will tell you to go to captain stern and then go to slaport city and then he will trade you for something. hope i helped :)
In the third generation of Pokemon games, a Deep Sea Scale will help Clamperl evolve into Gorebyss when traded. After giving the Scanner to Captain Stern in Slateport Harbor, he will offer the player a Deep Sea Scale.
You deliver Devon's Goods to Captain Stern who is in Slateport City's museum.
You get it from Captain Stern in Slateport City after finding the Scanner in the Abandoned Ship but you need a Pokemon with Dive.