you get kingdra by trading a seadra that is hold "dragon scale" you can get dragon scale by looking in the bottom level of mount mortar you need the HMs Strength, Surf, and Waterfall
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If held by seadra during a trade it will evolve to kingdra.
It's only proper weakness is dragon type moves
you have to evolve horsie into sedra then evolve sedra into kingdra.
Have your Seadra hold a Dragon Scale, then trade it with a friend. Seadra will then evolve into a Kingdra.
Kingdra is #230 in the national pokedex, and it is a Water-Dragon type Pokemon.