Tier 1->Tier 2
Compared to the other threats (and Amoong) in Tier 1 right now, I think Chien-Pao is undoubtedly the weakest. It doesn't get spread moves like Chi-yu and Gholdengo, and its STAB moves aren't as powerful as them, either. It gets Swords Dance, but it will likely never get the chance to use it due to the frailty it possesses. Due to this frailty, the most common thing run on it is Focus Sash, which is completely useless if any sort of hazards are up. It can almost never switch in safely either, so opportunities to take momentum with it often come at a cost. It gets bodied by common Pokémon like Ting-Lu, Arcanine (Which is even more threatening due to Intimidate + Will o Wisp), Iron Hands, Garganacl, and even tera Dragon DPult (Dragon Darts 123.5 - 146.1% v. Sucker Punch 57.7 - 68.1%). It can also be read by tera Ghost Chi-yu, who ignores Sacred Sword and melts it with any fire attacks, and Sucker Punch isn't even a Guaranteed OHKO against Gholdengo (252 Atk Sword of Ruin Chien-Pao Sucker Punch vs. 0 HP / 0 Def Gholdengo: 302-356 (95.8 - 113%) -- 68.8% chance to OHKO). If tailwind is up for the opponent, it gets worse. Always loses to Chi-Yu, can lose to Banded DNite (252+ Atk Choice Band Dragonite Dragon Claw vs. 0 HP / 0 Def Chien-Pao: 265-313 (88 - 103.9%) -- 25% chance to OHKO), Roaring Moon, Volcarona, Garchomp, etc. This isn't to say that Chien-Pao isn't a bad Pokémon by any means, it is still a great threat in the meta and can OHKO plenty of Pokemon, but I think it just needs to much support and has too many bad matchups to really be Tier 1.
Tier 4 -> Tier 2/3.
I will die on this hill fighting that Hydreigon is still terribly underrated. It has enough move versatility and raw power to be either a great support Pokémon or a late game sweeper, or be a combination of both. It is one of three Pokémon in the tier to get both Tailwind + Taunt (Murkow and Roaring Moon), and can't be affected by Prankster while it is able to Taunt Murkow after it gets its first move off. It is a good counter to the new Tailwind + Haze Murkow and Tera Steel Make it Rain Gholdengo combination that I've seen some people run. Taunt also can deal with Amoonguss and all Follow Me and Trick Room setters (Assuming mental herb isn't being run).
In terms of raw power, there isn't much that can't be said about Hydreigon. Base 105 Atk and 125 Sp. Atk, and it can run Specs/Life Orb/Scarf. It even has enough attack to run Stone Edge or EQ if you want for coverage. If running Life Orb, it is able to OHKO a large amount of the metagame in one hit with Draco Meteor, such as Chi-Yu, DNite, Chien-Pao, Glimmora, Palafin, Garchomp, Iron Bundle, Murkrow, Pelipper, etc. With Choice Specs, that number gets even higher. Flash Cannon and Snarl are the best options to run right after Draco, for Faries and for support, and gets plenty of coverage moves like Focus Blast, Heat Wave, Hydro Pump, Dark Pulse, Earth Power, etc.
In terms of weaknesses, Hydreigon has a lot of options. Tera Steel allows for the quad-weakness to Fairy to become a resist, as well as remove weakness to Dragon and Ice, and Levitate keeps the Ground Immunity, making it only weak to Fighting (Already weak to) and Fire. It also gives Flash Cannon that little extra boost to go from a possible 2HKO to a guaranteed OHKO on Sylveon, and go from a guaranteed 2HKO to a guaranteed OHKO on Hatterene.
It also doesn't like to stay out after launching Draco Meteor, and has issues with being rather frail for a support Pokémon, but it is base 90 Def and Sp. Def. Therefore, the best partners for Hydreigon are Amoonguss, who can keep Hydreigon alive with Pollen Puff or Clear Smog the Draco Meteor drop away, and redirect all moves that Hydreigon fear except Dazzling Gleam away from it. Ting-Lu/Arcanine are both good partners as well - Hydreigon can kill anything that threatens Ting-Lu, and it doesn't mind Vessel of Ruin if it's running enough physical coverage. Arcanine can Intimidate common physical counters to Hydreigon like Chien-Pao, Garchomp, and Tyranitar, and all of them fear Will o Wisp as well.
I prefer the mix between support and all out attacker, running Taunt/Tailwind/Draco/Flash Cannon. Hydreigon is either a very good support Pokemon that can deal out a lot of damage, or a very good Special Attacker that can run support or physical moves.
Tier 3 -> Tier 2
I know it was just demoted from Tier 2 to Tier 3, but I think it is too big of a change. Intimidate is great in this meta, and Arcanine is the premier runner of it, and the only common one as well. Safety Goggles allows it to sit on Amoonguss and focus on the other Pokémon on the field - which it can threaten with Snarl and Will o Wisp. It has Morning Sun to keep itself alive throughout the game, and there are very few clean ways to take it down, especially when Tera Water removes its weakness to EQ/EP/Rock Slide. Flare Blitz also provides a ton of damage on whatever it hits, and Wild Charge can be run for coverage at the cost of one of the support moves. It is similar to Hydreigon in that it can be a powerful Pokémon that runs support or a great support Pokémon that can dish a lot of damage, and the only difference is how you see it.
UR -> Tier 4/5
Pincurchin is the only mon in the metagame that can counter Psychic Terrain on switch in, which means it is also the only pokemon that gets Electric Terrain. I feel like this alone means it has an argument for Tier 3, as it means all Future Paradox Pokémon get the Quark Drive buff without the Booster Cell. It also means that things like Tera Normal Band Dragonite can spam ESpeed freely when Indeedee is on the other team. Pincurchin is also bulky enough that it can stand on its own in games, with moves like Wild Charge, Chilling Water, Liquidation, Poison Jab, Spikes + T Spikes, and even Sucker Punch which nullifies its major weakness of Speed. The poor speed means it runs as a threat of its own in TR, where Iron Hands already likes to be. It can run either Terrain Extender, to ensure the Quark Boost lasts, Electric Seed, for even more bulk, or even Air Ballon to ignore/swap into its only type weakness, and even swap in to teammate's EQuakes.
Tier 3 -> Tier 2
Almost forgot about this guy. Keeps stall alive in doubles by running Iron Defense, Recover, Body Press, and Tera Types that completely remove the weaknesses to things like Gholdengo that would otherwise melt it. Salt Cure gives it a good way to deal damage, esp. against all the Steel and Waters flying around. Purifying Salt helps against Gholdengo even more, as well as preventing status effects which makes it a problem for anyone who lets it sit around for too long (or doesn't run a Choice + Trick set), and it doesn't even need to set up Iron Defense to be a threat.
Other Minor Nominations I Thought Of:
Tier 5 -> Tier 3/4
Hatterene is the best TR setter IMO due to Magic Bounce (which is also good hazard prevention), and with Fake Out support + Focus Sash can 100% guarantee Trick Room goes up on Turn One, but can also threaten in Trick Room, due to high Sp. Atk and Calm Mind.
Tier 4 -> Tier 3
Kingambit can work in and out of TR due to Sucker Punch and Supreme Overlord, it runs Lum Berry/Safety Goggles which gives it a 1-Up on Amoonguss or other statuses. But in TR, it is one of the best late game sweepers. Tera typing helps it a lot against its strongest counters.
Tier 5 -> UR
Jumpluff really only has one gimmick, Strength Sap + Leech Seed + Substitute in Sun, but it isn't good. Tier 5 feels too high for a really weak Pokémon that has so many weaknesses that you can't even say it has a niche.
Tier 5 -> Tier 4
High speed, attack, and special attack, don't really see why it can't be higher as a solid mixed attacker (TBF I don't see it a lot so maybe I'm missing something).
Will probably do more nominations as time goes on
