Near the SS Tidal in Slateport City.
Capt. Stern is not in Pokemon Leaf Green. He is only in Pokemon Ruby, Saphire or Emerald.
Give it to capt. Stern in Slateport city. the boat house northeast of the Pokemon center.
he is in the laboratory in slateport that has many boats and near the bazaar
In the area where the SS Tidal is.
Go to the big wooden house at the south-east side of the Slateport. Inside there is a man who you need to talk to, he will ask you to find Capt. Stern ... and then you can go in.
it depends wich captain? capt stern he is in the museum in slateport Ask bill and then he will tell you something then go to the second floor of the museum you migth want to have good Pokemon against dark, flying and water because you figth against team aqua if in sapphire or emerald i don't know about ruby....
Captain Stern is on the top floor of the museum in Slateport City.
You need to get past Team Magma to advance in Pokemon Ruby. To get them to leave route 112, you have to find Captain Stern.
Pokemon ruby's version IS Pokemon ruby.
You talk to Mr. Stone in Rustboro City after delivering the letters to Champion Steven and Captain Stern.
The only way to find a DeepSeaTooth on Ruby, Sapphire or Emerald, is to give the scanner from the abandoned ship to Capt. Sterm in Slateport. When you do that, you can choose to get either the DeepSeaTooth or scale. In Pokemon Diamond and Pearl, you can get a new DeepSeaTooth on wild Carvahna or Shapedo. There is a 5% chance that one of these Pokemon will be holding one when you encounter it.
Arceus is not possible to find in Pokemon Ruby. It was released in 2007 with Pokemon Diamond and Pearl