VR UPDATE
A+ ---> S
A+ ---> A
A ---> B+
B+ ---> A-
B+ ---> A-
A- ---> B+
B- ---> B
A- ---> B+
B+ ---> B
Okay so a few controversial updates here. Greninja shouldn't be much of a surprise though. While Ash Gren is still very good, Greninja has once again proved itself one of the most dangerous offensive Pokemon in the tier, with a myriad of coverage options that makes it very difficult to reliably check or scout. So many teams are over prepared for Ash Gren, which only makes Protean that much more dangerous due to most of them losing to its coverage, Fini and Amoonguss in particular. It glues so many offensive teams together, and its coverage moves can easily be customizable to fit your team. Because of its lack of switch-ins, versatility, and its ability to pressure practically any team lacking Chansey, Greninja is easily one of the best Pokemon in the tier and deserves to be alongside the others in S. Heatran is a fantastic offensive and defensive Pokemon, but its Bloom Doom set is definitely a lot more prepared for in the current meta, as people are no longer blindly switching in their Finis into it, and the meta has responded with the influx in Zygarde as well as Garchomp. Dugtrio also completely invalidates its ability to stallbreak, because as long as it's around, there is no way Heatran can safely stay in for too long on anything. Dangerous and effective, but not A+. The Dugtrio rise should be of absolutely no surprise and everyone seemed to be in agreement on here.
Mega Scizor..... oh boy. I know a lot of people are going to be very angry at this aggressive decision, but we decided that there was no reason to give it extra time.
Tressed made a very good post about how much the meta is against Scizor right now, but even putting in A- is a slap in the face to other megas there such as Zam, Zard-Y, and Pinsir which require support but are downright threatening, have the ability to do a lot of work. Mega Scizor just does not accomplish much at all in the current meta outside of one thing and one thing only; checking Mega Metagross, unless they run Magnezone, then you just lose anyway. There is no mon in this entire tier that can check Mega Meta as well as Mega Scizor, but unless you are packing Pursuit, you aren't really accomplishing much, and just risk being set up fodder for Volcarona, Zard-X, and SD Lando-T, or just allowing a plethora of other Pokemon to come in on your obvious Roost, like Magnezone coming in and trapping you. The sheer prominence of Lele stopping it cold and Celesteela walling it to hell and back keeps Mega Scizor from ever finding an opportunity to sweep, and both of those Pokemon are found on a wide range of playstyles, while stall has Skarmory. Other stuff that Scizor "checks" such as Tapu Bulu, have started running SD Z Superpower, which just blows it out of the water, and Mega Zam commonly is seen with HP Fire now too. It's too passive without SD, and with SD, it's walled by everything. Pick your poison. Despite how much usage this Pokemon is still getting on the ladder, it's not a very good mon at all, and the rankings needs to reflect that. Besides, its usage will still be decently high as long as Meta exists.
Keldeo is rising because it's very underrated and a lot of the Pokemon in the meta that can switch into it bar Toxapex, are all worn down very easily. Fini takes quite a bit from Specs Hydro or Sword, and with its lack of recovery, it can't keep reliably switching into it constantly, so pairing it with something to overload it will usually allow Keldeo to easily spam Hydro or Scald late game. Scarf is also a decently solid set, as it has been seeing some usage in SPL as a form of speed control to threaten weakened offensive Pokemon such as Tapu Koko, Mega Meta, or Ash Greninja. Weavile is dropping because it's not that much better than Mamoswine in the current metagame, and it makes more sense to drop it then raise Mamo to B+, at least for now. Excadrill is a very uncommon site for obvious reasons; Speed tier and inability to consistently check what it's intended to check, while Sand Rush set is just not as threatening as it used to be because of Celesteela, Grassy Terrain, and the prominence of bulky Grasses. Also while it can set up SR against stall, it just gets trapped by Duggy anyway. Zygarde Dog has fallen way out of favor for its fatter counterpart, and its Speed tier is not worth it as much anymore.
Please don't hurt me.