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.
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there is no scanner on fire red/leaf green. Only on ruby, sapphire, emerald
the best pokemon to use is mudkip.
Abandoned ship, Rm. 2, while trying to get the Scanner after diving.
There is no place to buy elixers in Pokemon Sapphire. You can, however, use your Itemfinder to search them out randomly.
There is only one pokemon you can use it on and that is eevee to get vaporeon