Kingdra does (not!) evolve! smart one! lol
Evolve seadra into kingdra by trading him when he's holding it.
Kingdra does not evolve.
Seadra can be evolved into Kingdra by using a water stone
you have to evolve horsie into sedra then evolve sedra into kingdra.
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.