You can get Horsea by fishing on routes 132, 133, or 134 in Ruby. You may be able to catch it with a Good Rod but a Super Rod would be your best bet.
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To get a dragon scale is to catch a horsea or a bagon.
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.
you get horsea on route 226
You can get a Horsea in Pokemon Silver by finding it at the Whirl Islands.
Horsea evolves at level 32