you trade seadra holding an dragonscale.
Where to find a dragonscale: some wild horsea/gyarados/bagon hold them, but its rare.
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 evolves into Kingdra by giving it the hold item Dragon Scale, and trading it to someone.
Seadra does not evolve into Seaking. Ever. Period.
You have to give the Seadra a Dragon Scale then trade it (and back) and it will evolve into a Kingdra.
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.
No, to make Seadra evolve, you need a King's rock. Make Seadra hold it and trade it with someone. Then it will evolve and you can trade it back.
You cannot evolve Seadra using a Water Stone on it. To evolve Seadra into Kingdra you need to trade it while it is holding a Dragon Scale item.
Catch a horsea or seadra and put the item on seadra (evolve horsea) trade it with someone else and seadra will evolve into kingdra