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OP was really annoying to read.
Anyways, I doubt Drifblim will get much usage, even in UU. He was already mediocre before, and it almost seems like everything got buffed to hell, while Drifblim barely got anything.
No love for Omastar? With Drizzletoed support, its Speed goes through the roof, and +2 Surf will eat through everything. +2 Waterfall might even do a decent amount to Blissey.
...Starf Berry is pretty awesome. Baton Pass the Aqua Ring and Ingrain to Tropius, Substitute down to your Berry, then alternate between Protect and Substitute. You'll get an average of +2 in every stat with 16 Substitutes.
First off, I'd transfer those SpAtk EVs to HP, so it's easier to set up. I'd also recommend Leftovers; it's more beneficial in the long run.
Overall, I think the set has some advantage over CroCune and the like with its surprise factor, possibly letting you get free Calm Minds against a foe...
I'd just like to jump in because this is kind of pissing me off.
Paralysis is great for Snorlax because every full paralysis is another free Curse. Metagross doesn't directly benefit from full paralysis. In addition, comparing a base 100 power move (Return) with Body Slam is very different from...
This set looks like it's really good at what it does. But with Flygon's fantastic base SpAtk of 80, you're not going to be hitting stuff very hard. A good lure, but I don't see it doing much outside of eliminating one or two specific Pokémon. I'm not sure it's worth the team slot.