you'll have to talk to a researcher/scientist looking guy inside the building below the museum, then he'll tell you that the professor isn't there, then you'll have to go to the museum to find the professor on the 2nd level.
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Damn i wish i knew
You go to slateport and you deliver the Devon goods to captain stern.
You deliver Devon's Goods to Captain Stern who is in Slateport City's museum.
head back to the Devon building to report mission sucsess
Give it to the guy who asked you to get the goods back in rustboro city.