Seadra will evolve into Kingdra once you trade it to another player while it's holding a Dragon Scale.
You can evolve Seadra by giving it a Dragon Scale and then trade it. Seadra will then evolve into Kingdra.
Because it has to be on Pokemon Diamond,pearl or Plainum.
Seadra does not evolve into Seaking. Ever. Period.
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
Seadra will only evolve during a trade while it holds dragon scale.
never
Just trade the Seadra while it's holding a Dragon Scale. It'll evolve into Kingdra.
Yes, by trading a Seadra equipped with a dragon scale.
Seadra can be evolved into Kingdra by using a water stone
You can evolve Seadra by trading it with the Dragon Scale