Horsea evolves into Seadra at level 32, and Seadra evolves when it's holding a Dragon Scale and is traded. There is no other way.
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Yep with action replay, but if you dont have that then its a no. (:
Evolve seadra into kingdra by trading him when he's holding it.
Kingdra does not evolve.
There is no legitimate way to evolve it without trading.
You could try an Action Replay with Pokesav.