Catch a Horsea or Bagon. Sometimes you get lucky and they are carrying one. You need to catch either a Bagon or Horsea that is holding one. If you can find one on the ground, I've never seen it.
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To get a dragon scale is to catch a horsea or a bagon.
Use Thief, Covet, or Trick on or catch a wild Bagon or Horsea holding one. They have a 5% chance of holding a Dragon Scale.
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.
You can evolve Seadra by trading it with the Dragon Scale