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.
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Seadra can be evolved into Kingdra by using a water stone
don't you have to use a water stone or somthing
You have to give the Seadra a Dragon Scale then trade it (and back) and it will evolve into a Kingdra.
Seadra is a water type of Pokemon. If you manage to trade it while it holds a dragon scale, it will evolve.
don't worry in shiny gold seadra evolve to kingdra at lv 50 :)