Causes Seadra to evolve into Kingdra when traded
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Because it has to be on Pokemon Diamond,pearl or Plainum.
you have to catch a dragon Pokemon holding a dragon scale
catch a dragon Pokemon such as horsea and Bagon until you get one holding a dragon scale.
To get a dragon scale is to catch a horsea or a bagon.
You can evolve Seadra by trading it with the Dragon Scale