A Rank
: [First thing first, use the new sprite :P] Really nice typing (immune to Dragon, resists Bug, Dark, Electric, Fighting, Fire, Grass, and Water), which allows it, when it's defensive, to handle stuff like Mega Charizard-Y, Mega Charizard-X, Mega Sceptile, Keldeo, Mega Heracross, Mega Lopunny, Dragonite, Latios, Garchomp, etc really well. It also, thanks to Hyper Voice, can act as a check Substitute Mega Salamence. It struggles though because of its bad stats + mediocre typing pre-mega, which allows it to be hit super effectively by Dragons, who otherwise it'd wall. Also, offensive sets usually have to sacrifice coverage for longevity, which always makes them walled by either Scizor + Ferrothorn or Heatran. Once you figure out which coverage move DD sets aren't using, it's pretty easy to check. I think it should stay in
A, but I could easily be swayed to A+.
: [First thing first, use the new sprite :P] Diancie is also really solid. 160/160/110 offenses are really great, and with 4 attacks, it beats pretty much everything (with good prediction, of course). Mega Scizor is, even when Diancie runs HP Fire, a really annoying mon because of Bullet Punch, and needs to be removed before trying to sweep. Thanks to Zone's ubiquitousness though, this isn't too much of a problem. Nevertheless, I think for it being forced to split its offenses and weaken its defenses, I think it only deserves to stay in
A.
Machi argument is pretty convincing though. I'll think about A+ for it.
: If Dragon Dance wasn't bad before, it is now, because of Mega Mence + Altaria. And, unless a Ground immunity is essential, I'd much rather use defensive Altaria over CBBNite. That really only leaves CBNite. And speaking of Mega Altaria, in it, we gained a solid check to CBNite (it takes 42% max from a DNite EQ). A DNite locked into ESpeed/Outrage is also easily abused by the two new fairy megas + Mega Metagross. I'm not really sold on its effectiveness in the current metagame - I know it can be good, but it's not as good as it was previously. I'd personally put it in
B+ or A-.
: Of the stuff it used to wall, Azumarill is much less common, Greninja always uses HP Fire or Low Kick, Latios always runs HP Fire, Flamethrower Clefable is more common, but Clefable in general is less common, and Venusaur almost always runs HP Fire, and in general is much less common. On the other hand, Manaphy + Landorus-T I feel are better now, and Ferro is a nice stop to both. Then again, Magnezone is
much more common now, and helps any teams weak to Ferro defeat it with ease. When looking at the new megas, it's even clearer that Ferro's effect on the metagame has dropped (Mence has Fire Blast and Substitute, Diancie has HP Fire, Altaria has Fire Blast, Gallade has Close Combat, Lopunny has High Jump Kick, Metagross has Hammer Arm, Sceptile has Focus Blast/HP Fire, Sableye burns it, Knocks off its item, and reflects hazards, etc. Yes, stall in general wants a Grass-type, but at the moment I think Chesnaught is better than Ferro by a mile. I may be too harsh, but I think
B+ or A- may be ideal for Ferro.
Don't kill me jukain :'(
: Of the new megas, Mence uses Gliscor as setup bait, Gallade easily kills it with Ice Punch, and Metagross has Ice Punch as well. However, it does wall Special Altaria, Mega Diancie, and Mega Lopunny rather well. On paper, it looks about the same, but I think its intense competition with Lando-T should drop it down a few ranks, since Lando-T is really good now, and Gliscor won't work on the same team as it. This rise in usage in Lando-T also suggests a drop in usage of Lando-I, who Gliscor used to wall well. Gliscor just isn't the same mon it was, and I think
B+ or A- is ideal for Scor
: With Crunch, Dos is one of the few physical attackers that can beat Mega Slowbro reliably. It now also performs better against Ferrothorn, and can check Metagross without Grass Knot reliably. It still faces competition with Mence though, so I'd personally keep it
A.
: Heracross faces competition with both Gallade and Lopunny, and is also handled very well by Mega Altaria. It just isn't liking the shift to oRaS, and I definitely think a drop to
B+ or A- is ideal for Hera.
: Mega Latias, with Calm Mind, is absolutely stellar, and should be
A+ now. I'd add more, but I don't think this is controversial at all.
: Works really well with Lando-T, who's really everywhere. It also doesn't really mind new counters/checks being introduced, because it can easily Volt Switch out of a bad matchup to put the opposing team in a bad matchup. Should stay
A imo.
: No idea what to do with this. Yes, it's much more powerful than Gallade and Lopunny, but where is this power relevant? I can think of one example, Clefable (Medicham 2hkos it while the other two can't), but that is not enough for it to stay in A. Medicham's priority is more powerful than Lopunny's, yes, but I don't think that's worth trading 35 speed in this metagame. Medicham is cool with Substitute to stop Sucker Punch users, but Lopunny actually resists sucker punch, and thus is more reliable against them. Medicham is always walled by Doublade; Lopunny is never walled by Doublade, and Gallade can easily choose not to be by running Knock Off. Medicham is a cool dry passer, but Lopunny does it better with its higher Speed. Not to mention, Lopunny also can use Healing Wish to great effect, while Gallade can Taunt, use Twave, use Will-o-Wisp, use Destiny Bond, etc. Medicham just doesn't have much going for it; it isn't bad, but I'd never use it. I honestly think
B- is right for it, but then again, I think some B- mons are better than it.
: Handles Mega Mence well, so it's immediately pretty good because of that. However, I've heard Sp. Def Mega Mence can stall it out of HP Ice, so I'm not actually sure of that previous notion. Anyway, Mega Gyarados runs EQ less frequently, so Rotom definitely has a better matchup v. that. However, it's setup bait for Mega Latias, which is never good. I think just keeping it
A atm is right, but I could be convinced either way.
: Access to Stealth Rock is the only reason I'd ever use this over Lopunny or Gallade, and that isn't worth A. I personally think
B+ or A- is better, but I'm not that adamant about my position
: Call me crazy, but I think this belongs in
A+. It has unresisted coverage in just its stabs, which allows it to use stuff like Healing Wish to benefit its team, Baton Pass, which is a great tool for drypassing and getting momentum, Ice Punch, which kills Landog, or Fake Out, which allows it to safely mega evolve, in the remaining two slots. Its speed tier allows it to outspeed Ninja, which is always welcome. It also can check bisharp, thanks to resisting a 65 bp knock off and not really caring about Sucker Punch. It just does so much v. offense, and is also pretty decent against stall, since relying on resistances/immunities to beat it doesn't work.
: Thanks to Mega Mence's addition to the tier, it certainly is better. I'm not sure if it's as good as other A+ mons, but other people certainly think so. I'll remain neutral on this one for now, but I do know it should not move down.
A- Rank
: Thanks to its ability to check Mega Mence, this think is pretty damn good now. Dactyl has spectacular speed, and so actually benefits from the speed creep of oRaS (it beats Lopunny, Mence Sceptile, Beedrill, and Gallade, who are all pretty common now).
A for dactyl seems pretty obvious.

: Handled by Dactyl relatively well, so it seemingly is worse in this metagame. I haven't seen/used it, so instead of just jumping the gun, I'll stay neutral, but it does
seem slightly worse.

: I've really been enjoying using ScarfRachi, for its ability to check Latias decently. It is partially reliant on hax... but it is still effective without Iron Head hax, since Dragon Pulse/Stored Power isn't going to do a ton to Rachi, even at +2. Scarf Jirachi has U-Turn for scouting and Healing Wish for helping out its team. Mega Gardevoir is still pretty damn good, and SpD Jirachi is also a great answer to it. I think
A could make sense for it, but I'm again not that adamant on this.

: The reason Kyu-B rose to A- is because of its handling of Ninja. To handle Ninja, Kyu-B used to have to run a -Def nature. Now, thanks to Gunk Shot, it can't do this, without the risk of being 2hkod. Even with a neutral def nature, ninja still 2hkos it after rocks. Throw in the possibility of Low Kick, and Kyu-B just doesn't seem that great anymore. I'd move it to
B+ personally.
: Pretty obvious move to
A imo. Its scarf set is a great addition to a VoltSwitch team, and works great with Lando. Its main niche however is trapping steel types, which allows it to support its team extremely well. For example, if you can't fit HP Fire on diancie, bring along a Magnezone and you've covered up your ferro/skarm/scizor weakness.
: Great killer to stall + works really well with zone. I'd say keep it
A- for now, since nothing really has changed for it, but it's still solid.
: Rain is still really good, and toed should stay
A- for rain's viability. I'm getting a bit lazy in writing my descriptions, so I won't go in depth unless people deem it necessary.
: Sableye is amazing. Everyone's covered the bases pretty much, and a rise to
A+ is obvious.

: I'll just quote
mertyville on this one:
B
Really, with all those new Megas, there is not much reason no run Mega Ttar. The only reason to use Mega Tyranitar would be to run a Dragon Dance set and we already got enough more reliable Dragon Dancers in the Tier like Mega Charizard X, Mega Gyarados and Mega Salamence.
When you really need a Mega for a Sand Team, you should take advantage of putting something like Mega Aerodactyl which can take care of all those new threats.