You can get Horsea in Dark Cave or Whirl Islands. You'll need to Surf on water to get it.
The Dragonscale is an item in Pokemon Emerald version. There is a chance that certain Pokemon such a Horsea will be holding one when you catch it.
You could get a shiny Pokemon for crystal but you need luck to catch one ("_")
you cant but but if you can wait till august 8 2011 it will bet is Pokemon shade of darkness version and in Pokemon crystal light version
it's impossible to get remoraid. trade it from gold or silver.
To get a dragon scale is to catch a horsea or a bagon.