>>21376375Not the anon you're replying to, but I'd like to point out a few things:
With the exception of noivern, Pigeot outspeeds all of those hurricane users, and even then, when you factor in the amount you're missing, Mega Bird will be dealing more damage. And specs noivern is choice locked, meaning that once you use hurricane, you can't u-turn out of any switch-ins.
You can't compare megas that serve completely different roles, as a cleaner, it is comparable to aggron and houndoom, and will probably be about mega-man tier, but for UU.
The defoggers you've listed, other than aerodactyl and flygon work completely differently to how defog pigeot would work (fast, offensive, defog as utility).
Empoleon and blastoise (and sort-of golbat because of fang) are the only other offensive hazards control you have there, and they are slow, bulky hitters, with a play-style.
Moltres and articuno don't deserve a mention there with, their pebbles weakness. I wasn't even aware they were viable in UU.
The closest things to mega-bird's playstyle at the moment are starmie and aero, neither of which can u-turn out.
Mega Pidgeot will have a niche, it may end up in RU, but it will be used in UU.