Captain Stern is on the top floor of the museum in Slateport City.
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Capt. Stern is not in Pokemon Leaf Green. He is only in Pokemon Ruby, Saphire or Emerald.
You talk to Mr. Stone in Rustboro City after delivering the letters to Champion Steven and Captain Stern.
In the slateport city boat dock place
While in Lilycove City, you can find Captain Stern in that museum place where Team Magma/Aqua are standing by. I forgot how to get rid of them, but once you do, you can find Captain Stern in that museum place I mentioned.
You go to slateport and you deliver the Devon goods to captain stern.