sorry if you don't under stand my answer (i don't remember any of the towns names.)but you know town that has the museum( i think it is slateport but i am not sure)? go to the top right corner of that town. inside the building where the ship is. he will let you chose from two items that let you evolve clampearl. but you have to trade clampearl while holding that item. to get clampearl you need to get dive and dive under the water and look in the grass. and you got yourself a clampearl. well good luck sorry if that's not the town but i am sure it is. the boat is supposed to take you to lilycove (i think that's the name)
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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. Hope this helps.
Capt. Stern is not in Pokemon Leaf Green. He is only in Pokemon Ruby, Saphire or Emerald.
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.
It is only obtainable in Ruby, Sapphire, or Emerald by giving Capt. Stern the scanner in the harbor at Slateport. You obtain the scanner by finding it in the abandoned ship. In Diamond and Pearl, you can also find the DeepSea items on wild Pokemon. Wild Chinchou, Lantern, and Relicanth may hold a DeepSeaScale, and Carvahna and Sharpedo may hold a DeepSeaTooth. There is a 5% chance that one of these wild Pokemon may be holding those items.
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.