I am back with my nonsense. First 3 weeks of DPPWC I put almost 0 effort and used 2 old teams and one almost untested. Starting from week 4, I became more free and as a result, managed to get a 5-2 record, which I am sure is enough to entitle me to post my opinions here about the Tier. Unfortunately, we still lost in Quarters, but this meta is still developing and new strategies can be discovered frequently.
First thing, the teams I used. Won,t waste time describing them, since the tour wasn,t won anyway.
Week 1 (L):
https://pokepast.es/1c0cbada04d3a8d3
Week 2 (L):
https://pokepast.es/b4b61d4b9b42b0fd
Week 3 (W):
https://pokepast.es/98169d26355c6713
Week 4 (W):
https://pokepast.es/30813e764fa6780e
Week 5 (W):
https://pokepast.es/cd962af2ef81f7fa
Week 6 (W):
https://pokepast.es/298eb308b25537e9
Quarterfinals (W):
https://pokepast.es/170996b93a871bb4
A visual of all teams built prior to Quarters:
Teams built during Quarters (the top one was built today, after I have already played my game):
Now, the nominations. Before I start with nominating Mons up, I will show a list of Mons that are present on Tazz's last post but have not been used in DPPWC as of Quarters and say my opinion about each:

Horsea. This can stay ranked, is one of the many Swift Swimmers that are viable. Unlike the Rock ones its not weak to EQ or Vacuum Wave, unlike Mantyke its not weak to Rocks and unlike Buizel, its a special attacker.

Buizel. Same thing here. I am surprised it wasn,t used once so far.

Omanyte. Where is the Rain? I don,t particularly like the style, buts its GOOD. And Omanyte is one of the leading forces there. Should stay ranked.

Aron. This one wishes it had 1 more Speed point in order to be a good Scarfer. Unsuprising to see it not being used once, Cranidos is so much better (I will talk about Cranidos later). Just like Shieldon, its fully walled by Bronzor, but unlike it, it has almost 0 defensive utility, since its an offensive Mon... and not very good at that. I guess it can stay, but
nominating it to B-

Doduo. Goated in theory, in practice it sucks. Rock types (except Aron) are better than ever and I would rather use Taillow, who has strong Facade and eats berries. Probably the last good usage of this Mon is in the Mononormal team that some people sometimes use.
Nominating Doduo to Unranked, its worse than some of the Mons I used, and I used some very weird shit.
Another Mon that could go down:

Drifloon. Can be good under Screens, but too many weaknesses. It has been used 5 times so far... and it lost every battle.
Nominating it to B-.

Dratini. 3 uses and all are Ls. Its not much better than Bagon, so
B looks like a good rank.
Now, Mons that I think are better than current VR shows:

Gligar.
Nominating it from S (below Munchlax) to S (above Munchlax). During the tour, I have found sometimes reasons to no run Munchlax, but never to not run Gligar. The only one I can think of is expecting opponent to run 6 Ice moves (which is not a terrible idea, but no one does this). Even vs Rain, supposedly bad match-up, Gligar often does something on non-Rain turns. Bronzor and Koffing are the only things that can be considered good checks, since Mantyke and Snover can be blown up by Stone Edge. 19 Speed and great overall Stats matter a lot, Gligar does something in every battle. Its also very versatile: EQ and Aqua Tail are the only move with 100% usage, but after that you can use SD, Night Slash, Brick Break (to screw Screens), Agility, Baton Pass, Quick Attack, Stealth Rock, Wing Attack, Substitute and Stone Edge, each with their own value. This Mon is the best non Scarfer Revenge Killer in the game... and it can be a Scarfer too. Gligar is the best Mon in the Tier in my opinion.

Cranidos.
From A- to A+. For non Rock resists, this guy has an 80 Accuracy OHKO move. Head Smash's power is absurd and requires at least one Rock resist on each team to stop. Scarf set also has several good moves in last slot (Head Smash, EQ and secondary Rock STAB are always needed): Zen Headbutt is the one on site, but Blizzard/Ice Beam cover Gligar, while Pursuit surprises an escaping Gastly. Rock Polish sets are also good if you position yourself well. Some examples of Cranidos's performance during LCWC:
https://replay.pokemonshowdown.com/gen4lc-2463585442-rw6ukk06st4y6eq3248ijgll0qbph2jpw < This is me getting smashed by a Scarf Cranidos, who got 3 kills. It required a crit on Gligar and a 50/50 won with Stunky vs Mankey for it, but point stands, with Rock resists down, Cranidos is capable of incredible damage.
https://replay.pokemonshowdown.com/smogtours-gen4lc-881186?p2< Cranidos wears down a Bronzor and finishes the battle by OHKOing Munchlax from full, a task not many Mons without Fight Moves or Explosion are capable of doing.
https://replay.pokemonshowdown.com/smogtours-gen4lc-883528 < 2 Cranidos. One is Sash, killing a Gastly by reducing Speed with Rock Tomb. The other gets 2 OHKOs with Head Smash and even though it misses the third one, damage was enough to win the game by other means.
https://replay.pokemonshowdown.com/smogtours-gen4lc-884783 < Another game with 3 Head Smash KOs, though it required to avoid an Hydro Pump in the process.
https://replay.pokemonshowdown.com/smogtours-gen4lc-885026 < 2 Cranidos. The one that gets to attack kills the other one and another Mon.
https://replay.pokemonshowdown.com/smogtours-gen4lc-887152 < My game and there are 2 Cranidos here. Mine kills a +2 Gligar under Reflect. Opposing one scares my Cranidos (I haven,t considered Rock Polish and thought it was Scarf too), but then opponent commits a mistake and uses Rock Polish, allowing my Nosepass to blow it up. My Cranidos comes back 2 more times, killing a Staryu and then a Zigzagoon under Reflect, resisting Extreme Speed was key for it.
https://replay.pokemonshowdown.com/smogtours-gen4lc-889515 < Classic Scarf Cranidos cleaning. Scarf Gligar couldn,t have done this, since it can,t damage Levitate Bronzor.
https://replay.pokemonshowdown.com/smogtours-gen4lc-889164 < This is me using Sub + Rock Polish Cranidos and its the best Cranidos performance of the tour, getting 5 kills. The ammount of bulk that I put in the set allowed Cranidos to take Shadow Sneak and Vacuum Wave in a row.
https://replay.pokemonshowdown.com/smogtours-gen4lc-890951 < Superpower Cranidos getting 2 kills.
https://replay.pokemonshowdown.com/smogtours-gen4lc-891076 < This Sash Cranidos could have done a lot of damage if the lead Machop didn,t have Sash too.
https://replay.pokemonshowdown.com/smogtours-gen4lc-891835 < Another classic Scarf Cranidos getting 2 kills.
Hopefully this is enough to convince Cranidos is a great Mon that should be promoted. Some of my nominations below are made around Cranidos.

Croagunk: From A- to A. Used to dislike this Mon, but now I consider it to be on par with Stunky. Scarf sets are usable. Rain match-up is good and it resists Rock, so it can switch into Cranidos STAB once (though as seen in one of my games, sometimes it doesn,t do enough with Vacuum Wave).

Hippopotas: From Unranked to B+. I was the only one to use Sand twice and it won both times. Sand + Tspikes combined is a very good chip method, on top of removing other weathers. The Sdef Boost for Rock types allows them to take all kind of Special moves, this is relevant for Lileep, Shieldon... and Cranidos once again. In fact, almost every Rock type becomes way better if used in Sand, Kabuto and Omanyte for example are also usable to counter opposing Rain, I used a Nosepass too. Hippopotas's strength doesn,t end there, though, it also can switch into Cranidos's Head Smash, taking 50% max. Losing Sand Veil has not killed Sand, it can still work pretty well.

Tentacool:
From Unranked to B. Hippopota's partner in crime, but also usable without it. This Mon is still underrated, but its typing is great. Sure, Croagunk is better as a Fight + Water resist, but Tentacool also takes Ice and Fire moves. Spin is good and Tspikes vs No grounded poisons (the most common one happens to be Gastly) are very useful.

Shieldon. Yep,
I am nominating this guy again to B- . Under Sand it still walls a significant amount of the Tier. To prove that, I made a recopilation of the Mons all my opponents used and imagined what Shieldon + Sand could have done in each match-up:
Week 1:

. Shieldon fully walls Stunky and most likely Gastly too (Hidden Power is very rare). It possibly walled Munchlax too, the Mon revealed 3 moves and none of them was Superpower or Brick Break. Shieldon also switches into Scarf Cranidos non EQ moves (though Hippo does that too).
Week 2:

. A Gastly with 2 trappers + Pursuit Munchlax 100% sure won,t have Hidden Power, so Shieldon would have walled this. Regarding trappers, since my recommended item for Shieldon is Shed Shell, they don,t work. In Sand, Voltorb has a very low chance to 3HKO with Thunderbolt, so Shieldon could semi-reliably check it too, also scout Magnemite's moves (though that one does way more than Voltorb). The Munchlax likely had a Fight move, so he is discarded, but still, walling Gastly and kinda Voltorb, should be good enough.
Week 3:

. Munchlax had Superpower and there is a Bronzor, so the match-up is terrible for Shieldon. Its unable to wall Cyndaquil and Elekid too. Still, it makes lead Gastly almost useless, so there is that.
Week 4:
https://replay.pokemonshowdown.com/gen4lc-2477222879-j5dcn2jldip7r7y4exu1gd29nc4ou04pw The week in which I actually used Shieldon. It succesfully walled Gastly and in fact humillated it by avoiding WoW twice and freezing it. It didn,t have to battle Wynaut, but with Sand, Tspikes, Rock Blast being multi-hit and Shed Shell, it was not a bad match-up.
Week 5:

. Unless Hidden Power, Abra is walled. Munchlax revealed 2 moves and neither was Fight, so there was a chance. Funniest potential even was this one though:
+6 196+ Atk Zigzagoon Seed Bomb vs. 196 HP / 212+ Def Shieldon: 13-16 (59 - 72.7%) -- guaranteed 2HKO
Week 6:

The last 2 Mons are hell for Shieldon, but it fully walls Duskull and probably Smoochum too (unless Hidden Power). Munch revealed 2 moves, none were Fight, so there was a chance.
Quarters: :snubbul:

Stunky is walled for certain. Gastly 90% of the times too. Munchlax had a chance to be walled as well. Finally, though the scenario is unlikely (Shieldon would likely be worn down), there is this calc:
+2 180+ Atk Snover Wood Hammer vs. 196 HP / 212+ Def Shieldon: 18-22 (81.8 - 100%) -- 6.3% chance to OHKO
This means, Shieldon + Sand would contribute in every single game I played. Not necessarily winning them, but walling at least one Mon, sometimes potentially up to 4. This should be enough for B-, despite not being a traditional threat.

Smoochum.
From Unranked to B-. This sounds weird, since every single guy who tried to use this Mon, myself included, lost the battle. But I believe it can be a good Scarfer with Blizzard in Hail. The set I used was this:
Besitos (Smoochum) @ Choice Scarf
Ability: Forewarn
Level: 5
EVs: 240 SpA / 236 Spe
Modest Nature
- Blizzard
- Psychic
- Wish
- Copycat
Smoochum does not need offensive moves that are not STABs, it will never realistically click them. Copycat allows to avoid Sucker for one turn or chip down Munchlax with U-Turn provided by another Mon. Some other aplications for the moves exist. Meanwhile, Wish is meant to be used right before Smoochum dies in a bad match-up, allowing another Mon (Protect Snover, Gligar, etc.) to be brought back.

Onix.
From Unranked to B. Has Rocks + Boom and 17 Speed. Can be EVed to survive most Munxhlax moves. Checks Stunky, checks Aipom, switches into Koffing and switches into Cranidos once.

Larvitar.
From Unranked to B-.With DD under Screens, has devastating power. Not even Bronzor is a reliably stop, as seen in my week 3 game:
https://replay.pokemonshowdown.com/gen4lc-2471898489-51q6nbe9utltxx8fat9bu778dnk16hrpw

Trapinch.
From Unranked to B-. Didn,t get to use this Mon, but it has big potential. With min Attack, it has more Attack than Diglett. In fact, it has more everything except Speed. The set to use is this:
Dandelion (Trapinch) (M) @ Oran Berry
Ability: Arena Trap
Level: 5
EVs: 236 HP / 236 Def / 36 Spe
Impish Nature
- Earthquake
- Bug Bite
- 2 out of: Crunch, Quick Attack, Protect and Hidden Power Ice.
Vs Munchlax Trapinch comes, eats the berry with Bug Bite, then kills with 2 EQs.
Vs Cranidos, it comes in, takes 2 hits thanks to Oran Berry, and kills. There is no more Cranidos OHKOing your team.
Vs Stunky, it comes in, forces the skunk to explode and at worst trades. If Trapinch has Protect, it can straight up win. This works the same vs Voltorb, though there is a small chance of 2HKO with HP Ice.
Vs Aron, it traps and kills. Vs Shieldon it comes in and does nothing, since Shieldon is goated and has Shed Shell.
Croagunk, Diglett and Ponyta can be revenge killed, they don,t OHKO.
In bad match-ups, Trapinch can still eat some berries at least, for example vs Bronzor. Obviously, the set provided is not the only viable one, Trapinch can still be used in Trick Room with Life Orb.
So, this is it, hopefully I convinced everyone how to play and build in Cranidos and Shieldon meta.