don't you have to use a water stone or somthing
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After atleast lvl 50, I would evolve it at lvl 60-62
You have to give the Seadra a Dragon Scale then trade it (and back) and it will evolve into a Kingdra.
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.
don't worry in shiny gold seadra evolve to kingdra at lv 50 :)
it will evolve at lvl 25