Rises
A+ ---> S
Cinderace has proven itself to be easily one of the single best Pokemon in the tier. It has many reliable ways to beat its checks, with Gunk Shot taking down the would-be best counters such as Slowbro and Moltres, in tandem with its great ability to chip many things. It can hit basically the entire tier super effectively, with little resisting its coverage in tandem with Libero. I would say this mon is Top 2 rn, only slightly outdone by Magearna.
B+ ---> A-
This may seem like a controversial take, but I can explain. Even though it suffers from massive 4MSS, this thing is strong. Specs and LO are both powerful, and it can run many different moves (Psyshock, Mystical Fire, Ice Beam, Draco Meteor, Surf, and even Aura Sphere). Even though this does give it 4MSS, Latios has proven itself to be an overall good and strong mon.
B+ ---> A-
Kyurem is a great pick due to its dangerous offensive sets that can pose a threat to much of the tier. Both its Specs and Sub sets are very good in the current meta and warrants it going higher.
C+ ---> B/B-
Zeraora snook under all of our noses as an underrated pick as of now. It is a great speed control option that teams usually only check with Landorus Therian and Clefable, which can be played around through chip. Not too terrible.
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Drops
A+ ---> A
Melmetal is in a tricky spot right now. Even though it is a very strong and menacing physical attacker, there are simply too many teams that run its checks right now, mainly due to those checks being meta-prevalent threats, such as Garchomp, Cinderace, and Landorus-Therian. Also, Melmetal hates the chip it gets from all of the Stealth Rocks, Rocky Helmets, and Rough Skin going around.
A ---> B+
I have always seen Mandibuzz as an overrated Pokemon since the start of the Crown Tundra meta. It is a very status and Knock prone defogger that gets outclassed at its job by other better mons. It also wants to spread status and have 2 Dark STABs, leaving Mandibuzz in a strange, mediocre area of viability.
A ---> B+
Moltres has been falling off ever since Pheromosa left, due to it being very Knock prone and status prone. Sure, it can check the mighty Rillaboom, but again, it hates Knock Off a lot. Overall, this bird lost its niche, mostly just due to the change the meta observed after Pheromosa's leaving.
C- ---> UR
Why is this thing ranked? It is outclassed by every other relevant Dragon-type, and if your opponent has a Fairy type, you are basically screwed. Even if the opposing team does not have Fairies, it folds to special walls. Basically, when every other relevant Dragon does its job better, Regidrago simply does not have a place in the current meta.