clamperl
You must have a clamperl and let it hold the deepseatooth/deepseascale. Then, trade clamperl. If clamperl is holding the deepseatooth,it will evolve to Huntail. If it was deepseascale, it will evolve to a Gorebyss.
By trading with held items. Have it hold a Deepseascale for it to evolve into Gorebyss, or a Deepseatooth for it to evolve into Huntail.
The only Pokemon that evolves with the deepseatooth is Clamperl, who, using the deepseatooth, evolves into Huntail.
Clamperl when traded
Trade it holding the DeepSeaTooth or the DeepSeaScale. DeepSeaTooth will give you Huntail, DeepSeaScale will give you Gorebyss.
It is a hold item for Clamperl and if you trade it while holding the deepseatooth it evolves into something, but the other person gets its evolved form
The Deepseatooth is an item that you receive from Capt. Stern when you trade for the Scanner. If you give it to Clamperl to hold while trading, it will evolve into Huntail.
The deepseaclaw is not an item there is a deepseascale and deepseatooth.
In Pokemon emerald, ruby or sapphire: Get a Camperl and a Deepseatooth, equip it to Camperl, and trade it. It will instantly evolve into Huntail. Be careful, if you've already chosen the Deepseascale, you cannot get a Deepseatooth.
FIrst you must get a scanner. Then you give it to a guy in the slateport port. He will let you choose between deepseatooth and deepseascale.
If given to clampearl then traded it will become huntail.
Either in Route 13 or Route 17.