I will post on more of the proposed changes soon, but before I do, I wanted to nominate (or support depending on when Dell posts) Ursaring for B Rank.
With Quick Feet and a Jolly nature, Ursaring hits 343 Speed, outspeeding base 105s with a positive nature. Not only that, Ursaring, being the manly bear it is, wrecks everything. With 130 base Attack and a STAB boosted Facade, not much can switch into it. One exception is Rock and Steel-types who resist Facade. The issue here is that Ursaring has perfect coverage with powerful Close Combat and respectably strong Crunch. You can also run either Protect to ensure that you can activate your Orb safely or Swords Dance to sweep and wipe out your opponent's whole team! o:
Of course, you can always run Guts instead. Guts Ursaring will almost never (read: should never) sweep, but it hits so incredibly hard that it can serve as an effective wallbreaker.
252 Atk Guts Ursaring (+Atk) Facade vs 252 HP/252 Def Eviolite Tangela (+Def) : 49.4% - 58.38% (2-3 hits to KO)
Possible HP Damage: 165, 166, 169, 171, 172, 175, 177, 178, 180, 183, 184, 186, 189, 190, 192, 195
That means that if Tangela hopes to survive both hits, since it does not have passive Leftovers recovery, it needs to switch in without any hazards on the field while Ursaring has to hit one of the two lowest roles two times in a row. Basically what I am trying to say is that you have to get lucked really badly if you don't 2HKO with Facade.
Wrecked.
252 Atk Guts Ursaring (+Atk) Facade vs 252 HP/252 Def Alomomola (+Def) : 58.61% - 69.1% (2 hits to KO)
Wrecked.
As you can see, more offensive teams can falter quite easily under the pressure of Quick Feet Ursaring, and the sturdiest of physical walls cannot handle the Guts set. You really can't go wrong with Ursaring, and it definitely deserves B-Rank. C-Rank is laughable for such a powerhouse.