I have to disagree there Havak :/
Fire Blast is more useful on the CB set, in my opinion. It's worse against Special Defensive Bronzong but the ability to 2HKO Skarmory is pretty important. Also, with Magnezone support (as you suggest) Stone Edge becomes a very attractive option for Zapdos, Gyarados, and the like so you don't have to lock yourself into Outrage. I believe this should be mentioned on the set. Also, you should point out you are not guaranteed to 2HKO max/max Suicune even with Stealth Rock support (60% chance) and you are never going to without it. It should probably also be mentioned you can 2HKO the 401 HP / 297 Def Swampert with Outrage but even if one simply maxs out HP you no longer are guaranteed a 2HKO (although its extremely likely). Stealth Rock shouldn't just be recommended, it really should be mandatory. Also, you do not OHKO 252 HP / 220 Def Bold Celebi with a CB U-Turn, and you'll very rarely do it with SR support.
You only outrun Adamant Lucario btw. This is much more important to note in DPP since Lucario can now run Ice Punch on the SD set.
I also kinda don't like how through all the phrasing you seem to imply that this guy switches into Tyranitar and Heatran with ease. Even in the case of Heatran, a simple Life Orb Fire Blast can do 47% - 56% to Flygon. I wouldn't call that switching in with ease. You better be damn sure you are coming in on an EP before you switch Flygon into this since that's not exactly nothing damage as your analysis seems to imply. That's 2 switch ins to a resisted move with SR. With the CB set you aren't even running Roost so that's even worse. Not an ideal switch in at all.
The Screech set has some potential to it. I'd like to see the set comments oriented a bit more offensively. Why not Life Orb? Yeah, force switches with Screech and have Spikes that's great, but why not hammer the switches with a LO Outrage while you are at too? With Spikes and Outrage, you are taking major damage. If your opponent is foolish enough to stay in after a screech. Even better. You can switch in later and Roost off damage as well. I see Sub-Screech being such a waste on Flygon without taking advantage of his offensive abilities w/ Life Orb and Outrage.
On the Toxic stall set, why Timid ?_? Why not Jolly. Why weaken your STAB EQ?
I'm just going to put this bluntly. The Choice Specs set is garbage. Even with STAB Draco Meteor, it's just not worth it to Specs this guy with only 80 base Special attack. I'd really just scrap the set altogether. Try to work out a mixed set with Draco Meteor and then I can see some usefulness but the lack of SR weakness in no way would ever make me want to use this over Salamence.