Ok, I thought of this one when I was looking through the RS movesets:
Altaria @ Leftovers
Bold/Calm/Relaxed/Sassy/Modest nature
Draco Meteor
Flamethrower/Earthquake
Psych Up
Roost
Basically, Altaria is the only pokemon in the game to get a Draco Meteor type move, Psych Up, and the defenses to pull something like this off to any degree of success. Use Draco Meteor, then use Psych Up to get back to +0 special attack, allowing you to use it again. Use Flamethrower if you don't want the recharge time, and Roost if you took a lot of damage while using Psych Up. You can use Earthquake over Flamethrower, but you'll have to split your attacking EVs between both stats, making it weaker overall. Also, you will get walled by Skarmory and Bronzong as opposed to Heatran. Kind of like using Roar of Time, except you have the option of switching out or Roosting during the recharge time. I haven't tested this on shoddy yet, so I'm not sure of what the best nature or EV spread for this thing would be yet. What do you think?