Alright...this set may seem really, really weird, but I've been using it for a while and it's been doing really well. It's saved me in several battles, too.
Cyclohm @ Leftovers
Ability: Shield Dust
EVs: 76hp / 88 def / 10 speed / 184 Spec. atk / 152 Spec. def
Nature: Calm (+Spec. Def , - Attack)
Moves:
-Vacuum Wave
-Dragon Pulse
-Flamethrower
-Charge Beam
The whole idea behind this set is to switch in on something that you wont take much damage from, raise your spec. atk with charge beam, and then sweep with dragon pulse, beam, and flamethrower. Vacuum wave is there because it's a backup for my scizor, which I run on the same team, and more importantly, nobody expects a Cyclohm to have Vacuum wave (It can also KO some pokemon like tyranitar after a bunch of charge beam boosts). It's like a scizor in disguise (kinda). If I switch in my scizor on something barely has any hp (an azelf that used a focus sash, for example) then they will switch out, expecting bullet punch. Not so with Cyclohm. They think, "Alright, I'll put a big dent in that Cyclohm, possibly KO it, with boom." But Cyclohm says, "Lolz you can't!!!!11!1!!!:happybrain:" It's situational, yes, but I still love this set.