Copperajah up to B
I don't think B- is a good representation of Copper. I prefer the AV or LO offensive sets with how difficult it's coverage is to pivot into. Copper can still compress rocks with a defensive set without being complete deadweight like Bronzong is in most matchups. One of the few Pokemon capable of dealing with the surge in some Psychic-types decently well especially with the AV.

Gard up to A-
Basically what Yeezy said, this is incredibly hard to pivot into without using like Bronzong which it has Mystical Fire or Shadow Ball to chunk. Modest Moonblast 2HKOs or OHKOs most of the tier with a Specs especially with the trend of people relying on Doublade and Drapion/Weavile for their Psychic checks.

Chandy up A+
Chandy is absurd to pivot into unless you are using Gigalith, Umbreon, or Snorlax. Everything else doesn't take its coverage well and Umbreon can be 2HKOed by Specs Fire Blast after rocks and minimal chip.

252 SpA Choice Specs Chandelure Fire Blast vs. 252 HP / 252+ SpD Umbreon: 175-207 (44.4 - 52.5%) -- 80.9% chance to 2HKO after Stealth Rock and Leftovers recovery

It comes in on a lot of meta trends like Weezing and Roserade and proceeds to punch holes. Based on ladder experience it has like 5 viable sets with Specs, Scarf, Boots 4 atks, CM + Sub etc. all of which aren't easy to scout for until the damage or item is revealed. Defo a metagame defining threat imo and should be put in A+

Roserade up to A-
Beats the common trends in Rhyperior, bulky Waters + Weezing and sets up and absorbs Toxic Spikes. There are limited good switchins to its STABs bar Drapion and bulky Steel-types like Copper and Zong. Doublade gets 2HKOed by LO Leaf Storm and the others it can just punish with Sleep Powder. Super valuable for what it can provide to teams in both utlity and wallbreaking potential despite letting in Chandy pretty easily.

Avalugg down to B
Avalugg doesn't deal with a lot of the common trends with Chandy + more Fighting types gaining popularity. It can still check a good margin of physical attackers like Haxorus and Diggersby but it's stretched for moveslots to not be deadweight against a fair amount of stuff right now. I don't think it is bad but defo not at its prime.

Snorlax up to B
Maybe a controversial one with saying more Fighting-types gaining popularity but I think it offsets this by being a sponge for all the crazy threats in Reuniclus, Gardevoir, Sigilyph, Chandelure, Ninetales etc. I think Lax is fairly unexplored for how much it provides to a team and with good team support the Fighting matchup can be dealt with pretty easily.

Sigilyph up to A-
I've been experimenting with this the most on ladder. A fast offensive Psychic type that doesn't need to be choice locked and isn't susceptible to status/hazards + has reliable recovery and set up moves. It can beat all the Fighting-types in the tier and 4x resisting CC is super nice + it is able to break past the bulky Water-types with CM fairly easily aside from Milo being a pain with Haze so minimal chip is needed or Tspikes support to break it with Psychic or Psyshock. Insane coverage lets it break Rhyperior and I've also ran Protect to avoid First Impression from Goli and Sirfetch. Biggest flaw is dealing with Umbreon.

Flygon down to B-
I still think this Mon blows aside from revenging Haxorus and clicking U-turn. Against common bulkier teams it is literal deadweight outside of clicking U-turn. So aside from these the only things I think you value from it are it's resistances and ability. If others think it's enough to keep it B then I'm not fussed over it.

Sirfetch'd down to A-
I think this Mon is a bit too overhyped personally. It is a great breaker but it has a fair amount of issues and I honestly think it does struggle to stand out vs other Fighting-types. Locking into First Impression sucks a lot momentum wise and can be fairly predictable. It has no way of breaking strong Fighting resists particularly Weezing without killing itself with BB. Unlike the other Fighting-types it has little bulk or defensive utility to provide to a team compared to Croak, Bewear, Machamp etc. The main appeal personally is being able to click CC without drawback over anything else.

Silvally-Ghost nuke it
Charizard nuke it
Cincinno nuke it (Don't hate me Sage)

Other things I'm too lazy to explain:
Gigalith going up to at least B-/B
Machamp to B-
Indifferent about Jellicent rising to like B/B+ or something

Things worth discussing maybe:
I think Salazzle and Ninetales should both go up to B+ but there seem to be mixed thoughts on this. Especially the Ninetales for A- arguments I've seen
Toxicroak to B-

Below are what I think lower ranks should look like, indifferent about what else is added unless you goons add Eiscue, in which case I'll fight back:
C+ Rank
Alcremie
Barbaracle
Frosmoth
Gastrodon
Gigalith
Machamp
Pyukumuku
Rotom-F
Toxicroak

C Rank
Aromatisse (Added, it's better than Alcremie though so I'd personally swap them)
Claydol
Galvantula
Mr. Mime-Galar (Added)
Rillaboom (Dropped)
Rotom (Added)
Shiftry
Silvally-Fairy

C- Rank
Accelgor
Cramorant (Added, Idc where this is placed in C or D)
Goodra (Added)
Leafeon (Added)
Morpeko (Drop)
Steelix
Torkoal

D Rank
Coalossal (Added)