Ok so that Amoonguss section is a hot take but I have some notes to take here:
Your actually missing two Pokemon here, both being Psyspam staples! Those two being Ursaluna and Armarouge. I also don't really know why the last two Pokemon are there, they just feel kinda random tbh. But, Araquanid can also be an option here.
Since Fairy types are much rarer in this meta, with the most common ones being Whimsicott, Primarina and the Clefable line, Dragon types are a lot better
I've got three things to note here, one is the lack of respect for Sylveon, which can be a game sealing cleaner under TR or Tailwind, especially on BO, as well as the disrespect to Hatterene, a very powerful Fairy-type right now. Disregarding the Steel-type here is also kinda odd, as Pokemon like Gholdengo, Kingambit and Archaludon are top Pokemon as of now, especially with the latter being able to nuke Dragon-types with Draco Meteor, while Gholdengo and Kingambit can set up and just nuke the Dragons you mentioned. Finally, Ice-types, while not super prevalent, are an issue for the Dragon-types, with Baxcalibur and A9 being able to hit hard into opposing Dragon-types.
So the sets are kinda iffy, especially while not noticing Choice Scarf Mence, which is one of the better if not the best set ever IMO. Also the disregard to Hydro Pump in any sets is crazy. The supportive set is also something I don't think many have seen before, idk if it deserves a mention. Down to the partners, you mention Incineroar being nice, which you didn't address here. Also, Pokemon like Dragonite and Hydreigon I would argue aren't great partners for Salamence, especially Dnite, as that stacks the Dragon typing. The thing about Archaludon, though, is that the Steel-type resists all of the Dragon weaknesses. Hecidueye is also just, really random. Not a great Pokemon tbh, kinda overhyped, doesn't deserve a mention.
Its STABs let it threaten a huge amount of Pokemon, Gholdengo, Archaludon, Sinistcha, Amoonguss, Rillaboom, Incineroar, Whimsicott etc
Well, you actually lose to Gholdengo if it Terastilizes, even if you use Tera. While I do agree that Mamoswine has potential, out speeding Modest Max Speed Gholdengo is a good idea for the spread. But I like that you brought light to this Pokemon, I think it's a very cool Pokemon ^-^.
And another hot take...
I don't think Amoonguss is that good anymore. Trick Room is a more niche playstyle than when Calyrex-Ice was around, and the most common Trick Room style is Psyspam which Amoongus wants nothing to do with. Rain has Pelipper which blows it to pieces with STAB Hurricane, Archaludon often runs Tera Grass, Hisuian Typhlosion is picking up in usage (yes it can tera, but it usually prefers to leave that to its teammates), Maushold usually runs Safety Goggles and can just outrun and taunt the Mushroom, rendering it useless, so it can't check Mauseape reliably. Gholdengo is much more common now Flutter Mane is gone. It also faces major competition for the role of redirector: Maushold (Friend Guard, Beat Up shenaningans), Indeedee-f (sets Terrain), Clefairy (Friend Guard), Clefable (Skill Swap + Unaware lets it check Dongiri) and Smeargle (muchfaster Spore and Decorate) all have Follow Me, which can't be blocked by tera or item (I've never seen Stalwart Archaludon) while Sinistcha heals its partner, can set up Trick Room and has respectable offensive presence. When the VR comes, I would nomintate it for B rank.
B Rank is VERY low. I'd say A or A+ tier for the shoom. Smeargle isn't good at all right now, so that isn't a great mention. Aside from that, the mentions you have either don't have Spore or can't heal allies, two things that keep Amoonguss a amazing supporter in every game it's legal in. You mention Tera Grass Archaludon, but forcing Tera is actually amazing, as it allows partners to deal immense damage, like the Psyspam teams it finds itself on occasionally. It can also comfortably redirect Electro Shot and Drain Punch from Annihilape and Archaludon, respectively. Amoonguss is amazing, but a Pokemon that I don't think is good any more is Farigiraf.
Ok, well it's still a great Trick Room Pokemon, but just not nearly as useful as it was in Regulation G. This is greatly because of the lack of priority moves as of now. Here's a list:
Sucker Punch Pao - gone
Thunderclap Raging Bolt - gone
Fake Out Iron Hands - gone
Grassy Glide Ogerpon - gone
Aqua Jet Urshifu-R - gone
Sucker Punch Urshifu-S - gone
There are probably more, but that's just to list some. There just aren't as many priority moves for Farigiraf to deny. While it is still a amazing Pokemon, it just isn't as good as it was in Regulation G.