Just trade the Seadra while it's holding a Dragon Scale. It'll evolve into Kingdra.
Seadra holding a dragon scaleMachokeKadabraClamperlDuskullFeebasGraveler
Yes, it evolves into Seadra at level 32.
Horsea evolves into Seadra starting at Level 32.
Seadra does not evolve into Seaking. Ever. Period.
You can evolve Seadra by giving it a Dragon Scale and then trade it. Seadra will then evolve into Kingdra.
Seadra will evolve when you trade it while it holds the item Dragon Scale.
seadra
Seadra can never level up to evolve. You have to trade it when it is holding a Dragon Scale item. - Pokemon Guru
you need to give seadra a dragon scale (which you can obtain by catching or using thief on some dragon Pokemon (bagon for instance) and theres a chance that they will be holding a dragon scale) and then you trade your seadra holding the dragon scale and voila you have a kingdra
Seadra will only evolve during a trade while it holds dragon scale.
never
Yes, by trading a Seadra equipped with a dragon scale.