Horsea evolves at level 32. :)
level 32
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Horsea evolves at level 32
horsea does not evolve into kingdra. you have to evolve your horsea into a sedra (at lvl 32). then you have to give it a king scale and trade it to someone for it to evolve into kingdra.
At level 55
Horsea evolves into Seadra starting at level 32, and then Seadra evolves into Kingdra if it is traded while holding a Dragon Scale.
You train it until it reaches level 32.