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.
Horsea evolves into Seadra starting at level 32, and then Seadra evolves into Kingdra if it is traded while holding a Dragon Scale.
It only evolves If you trade it with a dragon scale
Horsea evolves into Seadra, starting at level 32. Seadra, then, can evolve into Kingdra, while holding a Dragon Scale and traded.
at level 32 and seadra evolves trading using a dragon scale.
Horsea evolves at level 32 into a Seadra.
Seadra evolves into Kingdra at level 45.
It evolves when it is traded while holding the king's rock.
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.
Train it to level 32.
Horsea evolves into Seadra at level 32.
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.
If you want to evolve seadra to kingdra you must level it to 38 or higher then you will be sure that when you trade it it will evolve
It evolves at level 32.
Horsea evolves into Seadra at level 32. Seadra evolves into Kingdra when it is holding a dragon scale and traded. You can find dragon scales as a held item of wild Bagon in the cave behind the waterfall in RSE.
It is a high level. It evolves into a Seadra at Level 32. Seadra evolves into a Kingdra trading with a Dragon Scale. Hope it Helps!