I'm going to go with this Scizor for the battle tower -
Scizor@leftovers/life orb (?)
Adamant/Impish (?)
Technician
EV's: 32 HP, 252 Attack, 224 Defense
X-Scissor
Bullet Punch
Substitute
Swords Dance
Basically, I'm going to begin the battle with a choice-trick/thunderwave strategy to really disable my opponent. Then I switch into this guy. I'll hide behind the subsitute and swords dance for a few turns, which IMO is manageable thanks to the defenses I'm putting into this. I'm still wondering if I should do an impish or adamant nature. After I've swords danced, I'll use Bullet Punch, which I know will do very decent damage thanks to STAB, technician, and the aforementioned swords dance. And since Bullet punch is pretty much a steel type quick attack, I won't have to worry much about speed.
Should I have leftovers or life orb? I'm thinking that leftovers is better if I'm going to be hiding behind substitute, and that life orb wouldn't be a very good option due to the fact that I'd lose more HP every turn.