Of course its an effective in a Sandstorm with the ability Sand Rush(i think that's what its callled) That ability with double its Speed making It a beast. And add Swords Dance on top of that while Holding a Baloon for an item, it can be unbearable. Definately add a Hippowdon/Tyranitar in your party to get a Sandstorm going. A good Moveset would Be:
Swords Dance-The Base Power of Attack being Doubled, you need this
Earthquake-the greatest STAB a Ground type can have
Rock Slide-Fire Types
Hope this helps...