Excadrill

Excadrill has had a wild ride since its inception in BW. Its Sand Rush ability made Excadrill the first true offensive sand sweeper, allowing it to outspeed the entire unboosted metagame, and nearly any Pokemon with a single boost! A STAB Earthquake coming off of an amazing 135 base Attack stat and the ability to boost it further while facing hopeless walls with Swords Dance made Excadrill a terrifying sweeper. It could even use Rapid Spin with impunity, because no Ghost-type would ever dare switching in. As such, it was eventually banished to the Uber tier, where much more dangerous threats lurked. However, Excadrill is back with a vengeance in the Dream World metagame, and is still as effective as ever.

Excadrill is not without its flaws, however. Without sand support, Excadrill lies at a rather upsetting base 88 Speed tier, outsped by opposing weather starters such as Choice Scarf Politoed and most variants of Ninetales. Excadrill's thin defenses force it to remain cautious if it plans to set up Swords Dance. Priority from Pokemon such as Breloom and Conkeldurr put a quick stop to Excadrill's sweeping fun. Sturdy walls such as Skarmory and Hippowdon can either phaze it or, in the latter's case, hit it with a powerful STAB Earthquake of its own. Still, these flaws are avoidable with the proper support, allowing Excadrill to remain the premier sand sweeper in the Dream World metagame.