After some discussion with the viability council about many of the suggestions you guys have made as well as some of our own, we've decided to make the following changes (with included reasons):
from S to A+: Still the best bulky water in the tier, but the introduction of Sheer Force Feraligatr has given offensive teams a very good water resist to work with. In addition to that, the offensive teams that Suicune has been dominant against have been starting to hit harder and harder with the introduction of Mamoswine. Overall, it's stretched further by this metagame than the past, so it's no longer going to be kept in S rank.
from A+ to A: With the introduction of two offensive mons sitting right at 80 Speed, Nidoqueen has started to fall behind against offensive teams more and is hardly the metagame staple it used to be. There are also many other Florges checks so it isn't as necessary as it used to be. Still has the unique typing and bulk that let it function as a check against many offensive Pokemon such as Beedrill, Heracross, and Whimsicott, so it's good at A rank.
from A- to A: That enormous physical bulk on one of the faster offensive Pokemon in the tier has been becoming more useful as of late as it lets Cobalion check Mega Beedrill, Mega Aerodactyl, and weakened +1 Feraligatr. Its typing allows it to be one of the few faster Pokemon that doesn't fold to Mamoswine's Ice Shard and also lets it use Scarf Hydreigon as set-up bait. Its defensive checks have also been falling out of favor so this metagame is very favorable to Cobalion.
from A- to A: This thing initially got a huge boost with the rising of Jirachi, as offense lost one of their premier Normal-type resists. Tri Attack and Thunderbolt have extremely good neutral coverage on the tier, making it very annoying to switch into. It has huge bulk when boosted with Eviolite and backed by Recover it has become much more annoying to take out. Many different abilities to abuse with Trace. Overall deserving of the rise.
from B+ to A-: This was proposed by a lot of you and was definitely worthy of the rise with the departure of the faster Alakazam. Its good speed tier and giant movepool make it very customizable to teams.
at A+: Very good tool for offensive teams to break down balance teams. It has been a fantastic addition to the metagame due to its STAB Ice Shard letting it check literally all of the faster Megas once they've been appropriately weakened. Its lack of resists, lack of boosting moves and its average Speed tier are holding it back from completely ravaging this metagame, but it's definitely going to be a staple.
at A-: While not having as much of an impact as Mamoswine, Mandibuzz has a lot going for it in this tier with that enormous bulk in conjunction with its good movepool lets it support the team with Defog while having many cool attacking options such as Knock Off, Foul Play, U-turn, and Brave Bird. Its Stealth Rock weakness along and tendency to be too passive don't make it much of a metagame staple, so we've decided to throw it into A-.
We've definitely been hearing your guys' input so feel free to keep the suggestions and discussion going