With the deep sea tooth or scales that you traded it for you give it to a clampearl to hold (The clam pokemon). Then you trade it, depending on what you traded the scanner for you will either get a Huntail or Gorebyss.
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when you want to give him the scanner he is in the harbor house in slateport.he will give you a deepsea tooth that raises a clamperl's sp attack or a deepsea something i forgot but it raises a clamperl's sp def. your chooce.
You can't use it for much, but you can exchange it for either a deepseatooth, or a deepseascale. The deepseatooth raises Clamperl's Sp. Atk, and the deepseascale evolves Clampearl into huntail. To exchange the scanner bring it to Capt. Stern in Slateport at the Slateport Harbor.
Capt. Stern is not in Pokemon Leaf Green. He is only in Pokemon Ruby, Saphire or Emerald.
To get Gorebyss or Huntail you have to go to the Abandoned Ship and there you see a scientist who tells you that he is looking for a Scanner. You have to find the scanner and go back to him and he tells you to give it to Capt.Stern. Fly back to Slateport and give the scanner to Capt.Stern and he will give you a choice of the Deepseascale and the Deepseatooth. You have to choose one. Both increase the Sp.Ack and Sp.Def of Clamperl. If you give Clamperl the item and trade it. It depends on what item you take from the Capt. if you get Gorebyss or Huntail. Both are evenly matched.
You first meet Capt. Stern upstairs in the museum, where team Aqua/Magma (I forget which) are originally blocking the doorway.