You trade seadra holding an item called dragonscale you can get dragonscale in Ruby Sapphire and Emerald
Seadra can be evolved into Kingdra by using a water stone
Seadra can be evolved at any point in the game; to evolve it into a Kingdra, you must first get a Dragon Scale and give it to him/her. Then you must trade it and voila, your Kingdra.
Seadra evolves into Kingdra at level 45.
Catch a horsea or seadra and put the item on seadra (evolve horsea) trade it with someone else and seadra will evolve into kingdra
Seadra evolves when you trade him while he is holding a King's Rock.
Yes, but seadra must be holding a dragon scale.
You have to give the Seadra a Dragon Scale then trade it (and back) and it will evolve into a Kingdra.
Seadra does not evolve into Seaking. Ever. Period.
If you mean Horsea evolves into Seadra its at level 32, but if Kingdra is what you are looking for you need to trade seadra while holding dragon scale.
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.
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.
Seadra learns hydro pump at level 40.