Go all the way to the top of slate port, then outside of slate port and there will be Team Aqua members in your way, talk to one of them. Next go back to the place that had all of the Team Aqua Members in the city and they should be gone. Go inside the museum (building they were surrounding) and it cost 50¥ to get in. Go upstairs, and that's where you'll find Stern. Hope that helps!((:
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Capt. Stern is not in Pokemon Leaf Green. He is only in Pokemon Ruby, Saphire or Emerald.
Captain Stern is on the top floor of the museum in Slateport City.
You first meet Capt. Stern upstairs in the museum, where team Aqua/Magma (I forget which) are originally blocking the doorway.
Go to the museum in Slateport. Talk to the grunts, one of them will give you a TM. Then go upstairs and talk to Capt. Stern. Two grunts will come. Fight them. Then Archie/Maxie will come and make bold claims. Your path will be cleared.
You have to talk to the scientist guy at the ship place in slateport city