Sub review. I'll reference mons in the current meta a lot throughout this one, so if you don't know what I'm talking about, you can check the spreadsheet.
Klavinine: From what it seems to me from the description, you don't really have a goal for this in the concept of the meta and I can't really see it interacting meaningfully with anything we have right now. You'll probably have to aim for it to do something specific beyond "Midspeed Special Attacker" to make it seem like a good fit in the meta and an interesting option to build and play with.
Exorsaltsim: That name seems like a nightmare, it'd def be easier to remember if it was just Exorsalt or something. Anyway this kinda reminds me of Enam-T in a way where it's really slow, but bulky and hits hard... at a glance. The issue is that while it can take hits and it can hit some decent damage, things like a lack of reliable recovery, vulnerability to chip damage and its EV choices being awkward (it can't be as bulky as it wants or as strong as it wants at the same time) hold it back a fair bit. You don't do all that well against Ghosts because, while you can take their Ghost moves, you can't quite shrug off their secondary STAB and nonstab Shadow Ball as your only way to hit them gives them an extra turn to setup and break you or just hit you a bunch. It gets worse when you have to deal with mons like Cetenor or Kunekrow that can just hit you super-effectively or for high damage and that bulk is just not that impressive anymore. It has some good traits notably in its movepool, but it just seems like you're trying to make it do something that a pure Fighting type would struggle with.
Punctgris: Fwiw this gets SD which could get a bit scary with Reckless, but I'm not quite sure. The meta does have some very good speed control options for it after all and while it's a bit hard to fully handle defensively, Harletritus as well as some of our Ghosts like Lanburn and Phantasohm give teams a better shot at dealing with it. I think this looks fine, its raw damage output for its speed is very high, but it's not that bulky, only has one STAB and has somewhat limited coverage for a Normal type.
Apuxapex: We need more Flying types and making up for Stakeout's power with a Rocks weakness is actually not a bad way to balance it out. That being said you can literally 2 shot resists with just Jolly Brave Bird, even stuff like max physdef Puffrost. The few relevant mons that properly switch-in (Harletritus, Kaerust, Phantasohm with Shadow Shield up) don't really last long at all due to not only having no way to hold it off long term, but also just take too much from Drill Run if it wants to click that. This is not to mention its amazing bulk, access to reliable recovery and great utility as well as its ability to come in on mons like Scorpixie and Manchini that Cetenor baits in and U-Turn's on. As it stands, I think Stakeout is super broken on this. Other abilities seem fine.
Pollusk: Idk if Corrosive Gas is in Gen 9, but item removal is really good so if it is, I'd consider that a viable move. Toxic Debris to punish Cetenor U-Turn is actually a super funny interaction, but its matchup against other physical attackers may not be that great due to the 4x weakness to Earthquake. The Kartrake matchup is especially rough since you have to predict it and Overheat just to chip it and Harletritus forces you out pretty easily. You can take hits from physical attackers that hit you neutrally, but aside from the Toxic Debris going up, if you're getting hit by something like Kunekrow, you're kinda forced to heal. Anyway short of it is its bulk seems a bit too middling, but maybe Toxic Debris makes up for that significantly. I could see a potential HP or SpDef buff to make some matchups like Spirimint and Kunekrow a bit easier to EV/stay healthy for, but you'd need to run calcs if I had to guess.
Sanaloe: I probably wouldn't describe this as a special attacker, this just seems like a nice defensive utility pick since its special bulk makes it especially good into Spirimint and Skeledune. You could consider making it a fair bit heavier if you want it to take Kartrake Heavy Slams more easily (95kgs or higher for 100bp, 119kgs or higher for 80bp), but physdef investment generally makes you somewhat safe against that. You could also add Spikes to make it easier to fit on teams by providing hazards. Also, Aromatherapy is dexited so you might want to consider giving it Heal Bell instead. This seems like it'd fit a nice role in the tier though.
Hogmire: Seems very spooky, but its bulk is well adjusted to the current meta seeing as you won't easily take hits from the fast threats and don't instantly force out the bulky mons who can also pose a threat to you. I am slightly worried about how easily Cetenor might get you in against Kaerust teams though, feels like you can kinda just come in on that Steel type and start mashing buttons. It doesn't have anything that can even pretend to wall it, but maybe its prediction aspect will hold it off. Feels like it might end up a bit extreme though.
First of all, welcome to the mod! Before rating the subs, I mostly just want to point out a few things in terms of formatting since your post is pretty big and it's a bit hard to look at as it stands for me. While separating the moves between level-up and TMs is fine, most people would probably also enjoy being able to see which moves are competitively relevant right away, so having those bolded or underlined or making another spoiler tag to highlight those could be helpful. It'd also be nice for the start and end points of each of the aspect of the mons to be clearer, you could do that through color-coding the name of the aspects of just putting some more spaces between each, especially when it comes to the bigger text-based ones.
Azhdashti: Seems like a very good Trick Room abuser, but that archetype hasn't had any development yet, so I'll judge without it. It probably needs to run Choice Specs otherwise our Regen mons can kinda bully it since Draco drops its damage output and its other options deal underwhelming damage. It's also gonna struggle against our Fairies since Cetenor is basically omnipresent and Harletritus being neutral to Sludge Bomb while having really good special bulk. Flash Cannon could let it get through Harletritus more easily without having to play into Focus Blast miss as much as well. You could consider increasing its HP a little to avoid getting 2HKO'd by neutral hits from Batacomb or Kunekrow as well.
Raptorelay: Seeing as this is a singles metagame, Receiver is practically useless, though this still might have potential. Its setup options are pretty good, but I'm a bit afraid that it'd overlap with Wyverock for Dragon Dance and Flameedle for Swords Dance, both of which share one of its types. It also has some good tools to use Scarf, but the Rocks weakness is really awkward to properly make use of it. I guess switching out the Fire typing for something else would make it work out quite well, but I understand if you'd rather not. Outside of that, there may be some really good move to make it work, but I don't have anything in mind. Anyway the potential is there, but it seems pretty bad without a few tweaks.
Valkyregent: This seems like a pretty interesting option for wallbreaking/sweeping since it obviously has an easy time finding opportunities to setup and this concept is currently underrepresented in this meta. I don't have much more to say about it, it's good and I don't think any changes are necessary. I guess I'll just mention this here though, you were talking about comparisons with Aegislash in the description, but seeing as this mod is a micrometa, that means only fakemons who win a slate are playable. Just making sure you're aware in the future, you don't have to consider any existing mons outside of this meta.
Mariaurna: Would recommend adding something like Sludge Bomb to hit Cetenor, seems like a fine wallbreaker otherwise.
Sinfernal: Honestly this typing on an offensive mon seems really nice for the meta at the moment, making it much easier to check Spirimint and Phantasohm, especially with STAB Sucker Punch and, obviously, Cinderace's stats and movepool are pretty solid overall. I can't see this using Moxie all that well seeing as it's pretty easily revenge-killed by Cetenor and Kartrake can tank a +1 Sucker Punch, but it might not be that bad and Intimidate will be good regardless.
Stuffiend: I can't see this using Shadow Shield as well as Fluffy seeing as it can't boost its speed, but I think I prefer it that way seeing as Phantasohm is another Ghost-type setup sweeper with Shadow Shield. Seeing as it's a Normal/Ghost, you could make it focus more on its physical Attack to switch into our other Ghosts and then threaten them with Shadow Sneak or Sucker Punch, basically making it a more specialized Ghost-type answer. That might also prevent it from being too similar to Lanburn as a Nasty Plot Ghost type with middling Speed.
Aruaura: Bulletproof would be a lot funnier if, of our three special Ghosts, one didn't have Ngas and another didn't have Moongeist Beam... Anyway I guess it works as an OTR mon, I'm just kinda doubting the concept itself, especially since one of the main sweeping threats, Phantasohm, just punches you really hard before you can even get TR up. You also might not have the time to properly setup NP. I think the issue here is moreso with the concept, but as far as executing said concept goes, this seems to do it pretty well.
Bewet: Seems like a very good stallmon, I could see it slotting on balance fine too with Flip Turn and Knock Off. You could remove Amnesia to prevent me from panicking over Amnesia/BU/Liquid/Recover as I'm always scared of demon sets (Toxic does not exist).
Ampertross: Why are you putting Defog and pivoting moves in Flavor on a mon with good bulk and solid type matchups lol. Anyway idk how much we need Galvanize Espeed seeing as Phantasohm resists it, but ig more options for Cetenor is always nice. Its defensive utility is pretty useful too, could maybe consider adding a move or an ability to promote that, up to you though.
: I don't like this but Cetenor exists so whatever.
Nervana: We don't really have any Psyfangs switchin that doesn't get destroyed by CC besides like Scorpixie, so this is kind of extreme. It's def not that frail with that 110 SpDef so it can actually 1v1 some special attackers if it wants to. Throwing out 156BP and 110BP STABs is just kind of a lot, but I wouldn't say it's straight up broken.
Moxygen: Kinda similar profile to Kunekrow as a Fighting type, so might end up outclassing it due to much better defensive traits+better secondary STAB vs slightly worse offensive stats. I'd prefer if this had a stat spread that differed more from Kunekrow.
Dragorilla: Triage Drain Punch isn't all that useful when the main fast threats are Phantasohm and Scarf Cetenor. Cetenor is especially rough for this to deal with, losing to it in the current meta is really rough. The idea isn't terrible, but the meta is really hostile to it at the moment I'd say.
Mortardvark: Monostab makes this seem kinda underwhelming. At least it has plenty of good coverage, but if it goes Choiced and locks itself into a Fighting move or if it has to deal with a special wall that takes Aura Sphere well, it's gonna be pretty abusable and will underperform.
Ungulacier: This gives me Piloswine vibes and I feel like it just wouldn't perform in this meta. Most mons are way faster than you and can hit you hard and you're getting worn down pretty quickly if you're switching into repeated U-Turns and Knock Offs with most top threats being able to hit you super effectively. The meta just moves too fast for it and, as a slow Ice type, that's especially bad.
Falkick: Bulky flyer is cool, but you could probably improve its SpDef a bit if you don't want this to turn into some kind of Avalugg. Could use better abilities as well, current ones are just kind of underwhelming. Would also encourage making its weight a bit more clear since we have Kartrake which uses Heavy Slam a lot and that interaction is pretty relevant, especially for a Ground type answer.
Gruesoil: I doubt this competes much with other Grounds since Kartrake is very offensive and Batacomb is different in many ways. Seems to be a nice answer to Skeledune and Phantasohm, being weak to Spirimint's Leaf Storm is kind of unfortunate, but it doesn't have to deal with every Ghost. Knock+Toxic is also quite an obnoxious combination to switch into and it's also Toxic immune making it a very nice Kartrake answer in general (though not a flawless one due to lack of recovery). Seems like a nice addition.
Spirox: You already know how fun I find Spirox, I will sacrifice a goat so it gets in.