I have nothing but absolute respect for the amount of time and effort the council has put into making this the best ORAS OU vr thread yet, though I feel as though there are a few pokemon that seem out of place within their respective rankings and could most definitely drop or rise. Here are some of my thoughts.
Azelf up to C+/B- Azelf's become THE suicide lead for both bird spam and hyper offense as of late, and has become more effective and adapted well to methods to deal with it. Skill swap is fantastic against Mega Sab and Diancie and can guarantee that you'll get rocks down, and taunt and explosion are both extremely valuable tools that allow Azelf to soften up its opponent and put them in revenge range for a partner or shut down potential set up sweepers or hazard setters. Much more valuable to offensive teams than anything in C is to their respective archetypes.
Mega Gardevoir down to B+ There really isn't any denying that Mega Gard's been gifted with the ability to plow through specific archetypes, though if Mega Alakazam is to drop to B+, this should too. Mega Gard has really been hurt by recent meta game trends, as scarfed physical attackers (mainly Excadrill and Rachi) have become more common, and the rise in bird spam can also be problematic. Overall, Mega Gardevoir's still great, but is stuck in an average speed tier and has a mediocre defense stat that hasn't helped it to prepare well for the increase in priority and fast physical attackers (whereas Zam has a few tricks up its sleeve).
Zapdos up to B+, Mega Manectric down to B. When comparing these two electric types, you'd find that one has been adapting to the metagame really well in recent months while the other hasn't. Zapdos' ground immunity, multitude of viable offensive and defensive sets, and ability to blanket check everything that's on the overwhelmingly omnipresent bird spam is an absolute blessing for teams atm, whereas Mega Manectric doesn't have that ground immunity to take care of scarfed Lando-T and Exca, can't pull off any sets well bar one, and takes up the mega slot you could be using for something else alongside just using Zapdos. Overall, Zapdos has been able to deal better with the rise in scarfed ground types and other metagame trends that have hurt Mega Manectric, and has less opportunity cost than Mega Mane even when its rocks weakness is considered. This one is to me, a matter of underrated vs overrated, and underrated should definitely win right now.
Manaphy up to A+ This one's been getting a lot of really valid discussion as of late, and there really isn't much more to say other than what's already been said. Manaphy is essentially the killer of all things slower than it, and can tear apart just about any archetype with either of its sets. Please move up, it's amazing how influential this thing's been lately.
Gliscor down to B+ This one's a little controversial rn, but there's no denying that Gliscor has lost some effectiveness recently. It's automatically prepared for, seeing as how every team carries ice coverage for Lando-T nowadays, and while the two are only similar in terms of typing, Gliscor's still hard to justify for a teamslot since Lando-T can compress so many roles and to put it on your team with Gliscor would be stacking weaknesses in a hilariously awful way. It's also worth mentioning that Gliscor only matches up well against bulkier builds and stall, which are beginning to find reliable ways to deal with it. Overall, the thing's just not as effective as it used to be, and has no business in A- alongside things like Serperior and Skarmory that aren't similar to Gliscor but have remained a lot more consistent and adaptable.
These two down to B Yeah, this one's old news by now. Mega Venu comes with more opportunity cost nowadays due to the greater amounts of utility and better abilities that both Amoonguss and Tangrowth provide your team with, as Tangrowth is better vs. sand due its actual ability to resist ground attacks, and Amoonguss' room for either more status than just sleep hax or clear smog allows it to provide your team with both a bulky grass type and status spreader. As for Mega Bro, it's just really weird in that you could just use Slowbro alongside another Mega and that it's CM set is completely stopped by any kind of status whatsoever. Please drop, they're just as effective as pretty much everything in B right now.
these two up to B. Duggy's ability to trap and kill big threats to stall like Heatran and Alakazam is just ridiculous, and it's quite capable of contributing to other play styles too, which sounds a lot better than what the other B- mons are bringing to the table. Then there's Diggersby, who was just recently nommed to rise by Sketchup, who provided us with some awesome calcs and proved that Diggersby is quite deserving of the hype other slow wallbreakers in Crawdaunt and Nidoking are getting. Not sure how to link Sketchup's nom, but its on page 43, so go check that out if you'd like more clarification, which you shouldn't considering how much better this thing is than everything in B- but Dugtrio.
Lastly,
Cobalion to C/C+ I've continued to make this nom and will until I at least know why nothing has been said about it. Cobalion is so much better than all the crap in C-, as while it isn't fantastic, it can provide your team with an impressive amount of role compression. Fast taunts, volt switches and stealth rocks are always nice, and the ability to check big threats to offense like Weavile and Serperior before a boost should allow for Cobal to be at least C, where it isn't AS criminally under ranked.
Edit: Suicune could also rise, but this is one that I feel really shouldn't need an explanation due to the council literally stating that they were looking to move Cune up soon.