Rampardos

Rampardos is pretty much the definition of the term 'glass cannon'. The good news? He possesses the highest base Attack stat found outside of Ubers, powerful STAB Rock-type attacks, and an awesome movepool with access to useful boosting options. On the other hand, he also has a low Speed stat and shoddy defenses with weaknesses to several common attacking types, making him extremely vulnerable to four of the most common priority moves in UU (Aqua Jet, Bullet Punch, Mach Punch, and Vacuum Wave). It goes without saying, then, that the metagame has not been very kind to Rampardos at all, and he is often shunned in favor of his bulkier competitors, who are not so easily revenge killed. Still, if you're looking for power, and lots of it, then maybe Rampardos is the Pokemon for you.