Im not sure if it would work but if ruby and emerald are the same then hes in the museam u have to beat 2 magma or aqua grunts (or whatever grunt is in emrald)
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In the Slateport museum.
In the slateport city boat dock place
You go to slateport and you deliver the Devon goods to captain stern.
Captain Stern is on the top floor of the museum in Slateport City.
Captain Stern is first located at Slateport City. After saving Mr Briney's Peeko on the tunnel, go to Briney's hut and talk to him. After delivering the goods at Steven and finishing the gym at the Dewford town, talk to Mr. Briney and go to Slateport City. Go up and enter the museum. On the second floor, captain stern was standing next to the scale model of SS Anne.