You will need to give the Scanner to Captain Stern in Slateport City. Once you obtain the Clear Bell from him, return to the Abandoned Ship/Sea Mauville and you can encounter Ho-oh at the north-western edge of the ship.
Once you get the scanner, go to slateport and find captain stern, he will trade you a hold item for it.
You can find a deep sea scale in Slateport City, Captain Stern will give it to you after you give him the Scanner which you can find on the Abandoned Ship.
after you beat the elite for the ferry is complete and captain stern is the captain of the ferry (i think check to find out)
Go to the shipyard, and talk to the guy standing by the table with a map on it. He will tell you Captain Stern isn't there. Leave the shipyard, and go into the museum. Go to the backroom, and talk to the scientist. He is Captain Stern. Team Aqua will come inside, and be prepared for two battles. After you beat them, you can give the parts to Capt. Stern. Hope this helps! :)
You get it from Captain Stern in Slateport City after finding the Scanner in the Abandoned Ship but you need a Pokemon with Dive.
You will need to give the Scanner to Captain Stern in Slateport City. Once you obtain the Clear Bell from him, return to the Abandoned Ship/Sea Mauville and you can encounter Ho-oh at the north-western edge of the ship.
Once you get the scanner, go to slateport and find captain stern, he will trade you a hold item for it.
You can find a deep sea scale in Slateport City, Captain Stern will give it to you after you give him the Scanner which you can find on the Abandoned Ship.
Captain Stern is on the top floor of the museum in Slateport City.
That's how you get the items in the first place by giving capt stern the scanner.
To get the DeepSeaScale you must go the the abandoned ship and dive after you have solved the little puzzle then dive down and get the scanner and then talk to Captain Stern (he will ask for the scanner in return for a DeepSeaScale or a DeepSeaTooth, the scanner is worthless so swap it and you have your DeepSeaScale.) Attach it to a Clamperl and trade it to get a Gorebyss.
after you beat the elite for the ferry is complete and captain stern is the captain of the ferry (i think check to find out)
i think you get it from steven.If now then sorry i dont know. :( <-----That's not right. You have to get the scanner first in the abandoned ship and you trade it to Captain Stern for a deepseascale or a deepseatooth.
If my memory's up to scratch, in the museum or where the submarines are (the blue and red building horizontal to the Pokemon center) in the town that's on the coast. Hope this helps :)
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).
The captain went to the stern of the ship to see if anyone was following them.