Seadra is not a dragon type pokemon (it's just water), however its evolution Kingrda is part dragon.
You can evolve Seadra by trading it to another game while it is holding a dragonscale.
or in Pokemon Black and White you can catch wild kingdra by fishing in rippling water (though it is very rare.)
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seadra
The dragon scale evoles seadra to kingra.When you trade seadra holding a dragon scale it will evolve to a kindra!
In Pokemon, A dragon scale is used to evolve Seadra into Kingra through a trade.
You can evolve Seadra by trading it with the Dragon Scale
Seadra is a water type of Pokemon. If you manage to trade it while it holds a dragon scale, it will evolve.