^^Scrafty isn't part Dragon type. He may have Dragon Dance, but he's a Dark/Fighting type Pokemon.
Also Mold Breaker always is better than Rivalry. Rivalry is good against the same gender, but messes you up against the opposite gender. Not really worth it.
For me Zoroak isn't really star-worthy, however in Dream World Sableye has been running loose everywhere (I know, I use him).