Catching wild Pokemon like Seadra, and other pseudo-dragon types.
WRONG! You need dive, surf, etc. When you can, find the old ship near slateport, i think. Find the dive spot somewhere, get the Scanner thing. Deliver it to the captain in slateport, who as a reward will give you a choice of a scale or the tooth, i think. I'm 99.9999% sure this is how it goes. I may be wrong about the ship I'm saying, but it IS a ship!
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You get it when you find the scanner on the abandoned ship and he will trade you a deep sea scale or a deep sea tooth the scale evolves clampearl or seadra into kingdra or gorebis via trade and the tooth evolves clampearl into huntail
When you trade Clamperl with the deep sea scale you get Gorebyss with the deep sea tooth you get Huntail.
You can find the Deep Sea Scale and the Deep Sea Tooth on Routes 13 and 17.
To evolve it, you have to give it a Deep Sea Tooth (Huntail) or a Deep Sea Scale (Gorebyss) and trade it.
no, not unless your playing vba.