Hello~
I understand that the council is trying to reduce the clutter in the VR rankings by being more restrictive in the nominations they accept. In appreciation to their efforts, I wish to nominate the lightbulb
UR -> B-
Rotom is an interesting mon. Typically, a Rotom wants to spread burns and pivot out to keep momentum for the team. Rotom-Heat is the most immediate idea, with a strong Overheat for immediate damage, but it gets shut down by the likes of Gastrodon and Swampert. Hence, you could try running Rotom-Mow, but it comes with the price of awful typing (offensively AND defensively) that barely hits anything
besides Gastrodon and Swampert.
Thus, I nominate base Rotom, a Rotom form with much better typing and a much more consistent STAB in Hex (Good synnergy with Wisp, doesn't nuke your SPA after one attack). This form outshines Rotom competition by having significantly better typing, and outshines other WispHex users by having ground immunity and the ability to pivot out of bad match-ups.
Of course there is a price - nothing comes for free. Base Rotom has significantly worse stats than any other form (primarily defensively - thus I recommend defensive investment), but it's significantly better at doing what it has to do than you'd expect. Here's a non-exhaustive list of volt switch blockers that Rotom reliably beats:







Kilowattrel is a funny case, as it's a special attacker but it's weak and only has Flying/Electric STAB. Mudsdale does get to rest but can't touch us with EQ/Body Press, so it's more of a stalemate.
Here's a list of volt switch blockers that you do have to be more careful with, but still trade favorably with:



Gastro takes too much damage from hex after burn, but can get a sludge bomb poison or an ice beam freeze; Golurk and Palossand have ghost STAB but fear taking a Hex to the face, and Rotom does outspeed; Torterra outspeeds, but needs to be at +2 and not burned to KO.
Here's a list of volt switch blockers that you actually don't beat:


(Volt Absorb Pawmot is not real and no one is using Toedscruel yet)
Does that sound reliable? It's also a really, REALLY good blanket check to steel types, since those tend to carry steel, fighting and ground-type coverage (I'm looking at you, Bronzong/Registeel). If I were to rank partners for OTR Diancie, base Rotom scores an A Tier easily. Thus, here's a few more mons that base Rotom randomly checks:




(Doesn't apply to Rest variants; will trade decently against standard Calm Mind Bronzong though)
It also happens to be a ghost type, so it can act as an above-average spin blocker. It does match up well into most spinners of the tier:






The exceptions being Brambleghast and Tatsugiri. Coalossal is not a horrible matchup - it can't be burned but it's super weak so you can sit on it for a couple turns.
To close things off, here's just a few more mons that Rotom didn't have to check, but it does anyway by virtue of being a Rotom:





(physical)
This list is non-exhaustive and Rotom does trade favorably against most physical attackers, exceptions being fire types like Infernape, Tauros-Paldea-Blaze and Incineroar, and status absorbers like Scrafty. It's a very consistent mon. Rotom has seen a 1% usage in the last tier shift, which is not a lot, but does show that more people have noticed the advantages of running base form over Mow or Heat.
Haaaving said that. This is not a physical wall. It's a defensive pivot. If you do decide to run it on balance, you will need to pair it with a sturdier tank like Dipplin to take hits from something like a Choice Band Breloom or a Flamigo (while it absorbs flying-type hits in return). In offense, it's there to form a volt-turn core and break through anything that would block a volt switch. It does perform these roles superbly and I constantly find myself considering it in the teambuilder. Thus, I do believe it should be ranked. Maybe not yet - maybe you need more people to consider the idea and start running it more often on ladder and tournaments. But I do believe in the lightbulb. It deserves a chance.
Most of the relevant hits Rotom takes are resists or immunities, but here's a few calcs that do matter in my experience:
4 SpA Rotom Hex (65 BP) vs. 0 HP / 4 SpD Flygon: 81-96 (26.9 - 31.8%) -- guaranteed 4HKO (Raw hex breaks Substitute Flygon variants)
252 Atk Life Orb Flygon Outrage vs. 252 HP / 252+ Def Rotom: 181-214 (59.5 - 70.3%) -- guaranteed 2HKO after Leftovers recovery
252 Atk Life Orb burned Flygon Outrage vs. 252 HP / 252+ Def Rotom: 90-107 (29.6 - 35.1%) -- 99.9% chance to 4HKO after Leftovers recovery (Guaranteed to not 2HKO after burn and leftovers recovery, I reckon?)
4 Atk burned Swampert Knock Off (97.5 BP) vs. 252 HP / 252+ Def Rotom: 65-77 (21.3 - 25.3%) -- 0.1% chance to 4HKO
0 SpA Gastrodon Ice Beam vs. 252 HP / 0 SpD Rotom: 75-89 (24.6 - 29.2%) -- possible 5HKO
+2 252 Atk burned Rhydon Stone Edge vs. 252 HP / 252+ Def Rotom: 138-163 (45.3 - 53.6%) -- 1.2% chance to 2HKO after Leftovers recovery
252 SpA Kilowattrel Thunderbolt vs. 252 HP / 0 SpD Rotom: 78-93 (25.6 - 30.5%) -- guaranteed 4HKO
4 SpA Rotom Hex (130 BP) vs. 0 HP / 0 SpD Kilowattrel: 204-240 (72.5 - 85.4%) -- guaranteed 2HKO after burn damage
252 Atk Tsareena Power Whip vs. 252 HP / 252+ Def Rotom: 157-186 (51.6 - 61.1%) -- guaranteed 2HKO (not a 2hko after burn)
4 Atk burned Avalugg Crunch vs. 252 HP / 252+ Def Rotom: 56-67 (18.4 - 22%) -- possible 5HKO
4 SpA Rotom Hex (130 BP) vs. 252 HP / 0 SpD Palossand: 342-404 (91.4 - 108%) -- 50% chance to OHKO (81.3% chance to OHKO after burn damage)
252+ Atk Choice Band burned Golurk Poltergeist vs. 252 HP / 252+ Def Rotom: 243-286 (79.9 - 94%) -- guaranteed 2HKO after Leftovers recovery
4 SpA Rotom Hex (130 BP) vs. 0 HP / 0 SpD Golurk: 324-384 (101.5 - 120.3%) -- guaranteed OHKO
0 SpA Rotom Hex (130 BP) vs. +1 252 HP / 204+ SpD Bronzong: 122-146 (36 - 43.1%) -- guaranteed 3HKO after Leftovers recovery and burn damage (easily chipped down or even 1v1'd if we tera steel)
0 Atk burned Copperajah Knock Off (97.5 BP) vs. 252 HP / 252+ Def Rotom: 74-88 (24.3 - 28.9%) -- 99.5% chance to 4HKO
And here's a few replays:
https://replay.pokemonshowdown.com/gen9nu-2286348123-gkm8qexmwq2w49xx92qpl1od6f37a5gpw?p2 (Doing the standard break-through-ground-type-and-then-start-pivoting-and-wisp-spreading Rotom thing)
https://replay.pokemonshowdown.com/gen9nu-2286271880-0uzl2si87g2d60b7pwje4qpqut45ivvpw?p2 (Exhibit nº 2)
https://replay.pokemonshowdown.com/gen9nu-2281988655-o4y8xg9ur2h0uiwdng2xsww579qhhr7pw?p2 (Exhibit nº 3)
https://replay.pokemonshowdown.com/gen9nu-2287107469-8m7kgoiawagla1d7qt4gqiow6kjs98ppw?p2 (Rotom on physical wall duty)
https://replay.pokemonshowdown.com/gen9nu-2287178962-jq079enohcnq06jo57d1vup78tmm63zpw?p2 (Rotom on stallbreaker duty)
https://replay.pokemonshowdown.com/gen9nu-2286891872-hr54yqh7zooy2b7ccms0oykjsto9927pw (Rotom on Flygon-checking duty)
I'm telling you, Rotom pops off. Here's a few more suggestions, since we're here. I'll try to stick to mons I have used, or at least seen plenty of on ladder (But I do support the Hisuian Avalugg, Jolteon and Mismagius nominations, you guys can do it).

:
C -> B/B+
Dipplin fills a dying niche in balance of being a phaser with self-sustaining longevity (i.e. Recover/Roost). Wish can be undesirable by virtue of requiring two turns to heal, so the only competition it has is Milotic, Altaria and Bombirdier. Dipplin stands out for having significantly better physical bulk than the competition, the ability to absorb Knock Offs and the less passive role with Growth. Even just speaking of Knock Off absorbers, the tier barely has any.

:
UR -> B+
Best priority user of the tier by a landslide (not strongest, since banded First Impression does more damage). It only has one niche, but realistically, it's the only niche it needs. Still unranked despite farming tournament wins, apparently.

:
C -> C
Golurk deserves to remain ranked. It is very awkward to teambuild with, so I belive the C rank is fair, but it does the (very) high damage + decent bulk thing really well. Gotta be prepared for the lurkers.

:
A- -> A/A+
Very splashable mon with a combination of STABs that can be very difficult to answer defensively. Scarf, band and even substitute sets are all very playable. Candidate for current strongest fighting type in the tier, alongside the Tauros forms.

:
B -> A-/B+
Great speed tier, decent damage, good coverage, access to priority, can be a scarfer or all-out-attacker, gets Switcheroo to be a physical Munkidori. Very versatile mon overall. Making fun of Infernape is funny but does not match the current state of the tier.
*Resisting the urge to nominate Breloom to UR, but B/B- rank sounds fair*

:
S -> A+
I'm part of the crowd that belives Flygon isn't any better than the guys in A+. It provides a lot of utility by just being in a team, but it's not the kind of S-tier splashable mon that Mienshao used to be.

:
A- -> B
Has a decent niche on paper, to be a physically bulky spikes setter (plus immunity!) but it just loses eviolite and dies so fast in practice. Can be used in fast-paced teams (where Toxic is kinda meh) but in slower teams it's worn down too easilly - and do you even have the time to set spikes in fast-paced teams? Especially in the Cinccino meta? It's not horrible, just not as easy to fit into teams as the guys in A- tier, or even those in B+ imo.