Alright 24 hour warning and sub review. A few things to note here is that I think we should currently prioritize special walls, as we already have Heraleo and Beetilient covering most physical attackers pretty well but we don't have anything to really take on special attackers. Nympheral, Slashowa and Fuscicea are currently very difficult to stop, each having basically one specific reliable counter. This is why we need more special walls.
Golch: Seems fine as a chlorophyll sweeper, kind of underwhelming otherwise. I'd give it a good buff in either overall bulk or speed to make it more efficient either as a defensive pokemon or as a wallbreaker outside of sun.
Mahcidem: I know that this is a joke sub, but I have to point out that the current meta has absolutely nothing for physical Fighting/Psychic types outside of Spirox (depending on coverage) and Cosmole. Our 2 best physical walls, Heraleo and Beetilient, are both hit super effectively by stabs. This doesn't seem too bad since it lacks coverage for Spirox but yeah watch out with Fighting/Psychic types.
Gorilax: Honestly, probably my favorite Fighting/Psychic submission so far because it's not an actual offensive threat, making it a lot easier to handle and also because it goes against what makes the type good while still staying viable. I don't believe it's quite as passive as you made it out to be, 83 spatk is low but it's enough to scare some frailer pokemon with its stab. It also has Night Shade to deal consistent damage, letting it at least weaken setup sweepers like Swords Dance Cetaidon. Outside of that, defensive typing is shit but the bulk means it can take neutral hits very well which can make it interesting as a blanket wall, both on the physical and special side, whichever one the meta needs. Also another wish passer which is nice. Anyway yeah I like it.
Cholleap: As I said, new special walls are cool. This seems like it can handle Nympheral especially well and outspeeding the other big special attackers is also quite good, though it doesn't stand a chance against Fuscicea's Ice Beam. Switching around Leech Seed, Dual Spikes and Scorching Sands also sounds really annoying. I think it's good though I wish it had some form of recovery outside of Leech Seed, as it'll probably get worn down quickly, especially if it gets Toxic'd or has to switch into hazards.
Hallucidrake: Good special wall, good utility, it's good. I especially like the inclusion of Soundproof to deal with Slashowa. I don't have much to say, it does what it wants to do well. I also think the flavor fits very well for it so well done.
Hoarfrolisk: I think you already know that I'd prefer this to be bulkier on the special side than the physical one, but that's just me worrying too much about the meta. I think this is cool as a Hail setter, slow pivoting is great and access to Blizzard off of a high special attack is also solid. I feel like Refrigerate isn't gonna be used over Snow Warning since you didn't give it any good normal special move to use and I can't see this going physical (because of burns, intimidate, lower immediate damage, etc.) so I feel like you should add Hyper Voice, which I guess makes it somewhat similar to Aurorus. My main issue with it is that it seems you meant it be used as some kind of bulky pivot or wall, but I feel with its weakness to rocks and lack of recovery, you should make it more offensively oriented. I'm currently writing this at 1am so writing isn't very coherent, but basically, add Hyper Voice/try to make it more offensively biased, notably by increasing its offensive stats. Just increasing physical attack could also be enough to make refrigerate viable and make it better offensively at the same time as well.
Conjuroo: I'm gonna be honest, it's a bit weird but I like it. It seems like a solid lead for Trick Room or Screens as it gets the terrain condition these teams want, rocks and U-Turn. I don't see Psychic Surge team being super good, but supporting something like Expanding Force Harzodia could be very cool. I think it's also interesting offensively as both of its ability give it the option to safely use higher base power moves, but lackluster coverage and low offensive stats make it balanced without seemind bad. Overall, kinda weird but quite interesting.
Mentabox: This is honestly a really cool concept and it works really well in our current metagame, though the issue is that it's not actually that hard for it to go mixed. It doesn't really need investment to make Psychic work on a physical set and that just removes one of its best counters in Beetilient. This is probably not broken though, depending on the set, many defensive mons with decent bulk on both attacking sides, such as Clavelye or Burrodger, will be able to take this on. But yeah I wish there was more opportunity cost to going mixed.
Hydrice: This looks very weak. Its special attack stat isn't that great and it doesn't get any special boosting moves so it's really easy to wall. Ice Face should be used to set up so I recommend adding some special setup moves.
Ruslam: Lack of physical coverage for Spirox and Cosmole makes this balanced. Attacking stats seem a bit too low though, you might want to increase Attack or Speed a bit.
Terrabull: Seems cool as a Sheer Force user, speed and power are balanced for the ability. I kinda dislike it with intimidate since we already have a few really bulky physical walls and I don't think adding more is the right decision here. I also dislike Magic Guard here because we already have 2 other Magic Guard users. It's balanced, but I just dislike 2 of its abilities.
Punkminder: I like how you kept this balanced by having its abilities boost its STABs and kept its offenses low. This works really well in the context of the current metagame as its coverage will be weaker and will allow more counterplay while staying a strong offensive threat. It's good, no complaints.
Coldrex: Seems like a fine sweeper, not too difficult to handle early on, but still a threat. Not much to say here other than it doesn't seem super original.
Freezlinger: As you said it's a pretty basic slow offensive ice type that could setup on the physical side. Seems kind of unoriginal. My only worry is that Ice Scales might make this too bulky for an offensive mon with good coverage, but it's probably fine.
Chalicotarium: A good special wall that makes use of Grassy Glide to deal with specific pokemon it needs to deal with is original and works quite well. It won't use offensive Grassy Glide sets since its attack and speed are mediocre, but using it to be a wall that can KO Fuscicea or Nympheral regardless of wether or not it's weakened still makes it a very good user of the move. Rapid Spin, Knock, U-Turn and Rocks also give it a few support options, making it easier to slot on teams. Overall, it's a cool special wall and I like the way it uses Grassy Glide a lot.
Tough to wall but quite slow. It seems like a great Trick Room user, offensive teams will have a lot of trouble dealing with it and even more balanced teams will receive a beating. Belly Drum Ice Shard looks dangerous but many offensive mons resist Ice and it's slower than some of our walls, even with investment. Slack Off seems fine, it won't be used as a straight up wall because of it, but it can use it to survive a while and give itself more time to break through the opposing team. I like it, it's a cool Trick Room wallbreaker.
Drootbao: Calm Mind with great physical bulk and Triage scares me. It seems difficult to play around since it also has solid coverage. You'd probably need some kind of faster grass resist such as Thermasorb or Magroach to deal with it since defensive mons aren't gonna be able to reliably Toxic or phaze it. I would prefer if its physical bulk or special attack were lowered, to make it less bulky or less immediately threatening.
Senserval: Analytic Focus Punch paired with Sucker Punch and Substitute seems insanely tricky to play around. It seems like a tough pokemon to use and to play around which is interesting. The lack of reliable coverage for Spirox and Cosmole is something I appreciate, but it's cool that it still has some ways to mess with them. Overall, seems very interesting and balanced.
Glaciallo: Dual stab Skill Link is very strong so the attack stat doesn't seem too low. The main issue with it is that it's coverage is pretty weak making it pretty difficult for it to get past resists like Heraleo, as something like Stomping Tantrum still won't deal a lot of damage. It's also completely stopped by Beetilient. It's not weak but I feel like you could give it something like Earthquake.
Blizzmetrodon: It seems balanced, but also very similar to Laopharsi, which is another Technician dragon type that makes use of Dual Chop, Scale Shot and Bulldoze. Maybe you should try to make it a priority spammer with lower speed, but Swords Dance and Ice Shard, similarly to Scizor, to try to differentiate it.
Mothraia: This seems like it'd run either a setup sweeper set or defensive. Calm Mind with its good coverage and recovery seems decent, while its access to Defog and good bulk makes it a nice defensive mon. It also seems quite interesting as a rain abuser, as its fire weakness is neutered and it also gets to spam Thunders and Hurricanes with 60% confusion or paralysis chance. Seems fine and versatile.
Majestrap: A lot of its setup sets compete with Prairett, which has Poison Heal to be a better stallbreaker and still isn't a very good pokemon in the current meta. Stab Earthquake is a good edge over it but I would increase its attack by around 20 points to make it more potent as a wallbreaker with Swords Dance or Coil. Other than that, seems balanced and fine, you already talked about all the other things it can do.
Refrigerake: I'm not sure if this would really run defensive sets because... defensive ice type... Anyway, I would expect specially offensive boots sets with 3 attacks and Soft-Boiled to pop up as Refrigerate Hyper Voice hits hard. Tough Claws sets would most likely not be that great due to a lack of Ice type contact moves (Don't give it Triple Axel though). Trick Room sets also offer a lot for Trick Room teams as a whole which is cool. Anyway, I don't think it's quite as versatile as you wanted it to be, but it's still good.
Treementous: First of all, Flower Gift is fine. It's interesting to see a physical sun abusers since they usually use Solar Power or Weather Ball. Flower Veil with Bulk Up reminds me of Restriction's Teslaple, which had Flower Veil with Calm Mind. Flower Veil with setup is honestly kind of insane because of the status immunity. It also has huge bulk, making it very easy to setup. I would currently
veto this and will ask you to remove Bulk Up so it can't be an absurd setup sweeper. Other than that, I like the sub.
Frigidrake: This is a similar concept to okispokis's Ice/Dragon sub so I would recommend getting in contact with them and trying to work and improve the submission together.
Drakeniout: An offensive Magic Bouncer is cool, works as an anti-lead. Doesn't seem overwhelming offensively. My main issue with this is Boomburst because it's Boomburst and Boomburst is kind of a dumb move, even without stab. It's balanced, I just dislike Boomburst.
Wybsozern: Currently, I feel like it'd only see niche use as an Aurora Veil or Hail setter. I feel like it's missing important moves such as Blizzard or Draco Meteor that could make it a legitimate threat offensively. It could also have its spatk and speed both increased by about 10 points to be more threatening offensively.
I doubt this would run offensive sets outside of Bulk Up. However, similarly to Spiderpig2398's sub, a bulky setup sweeper with status immunity is kind of crazy. As such, I would lower its special defense by 10-15 points to make it easier to handle. Outside of that, it seems nice as a generally bulky pokemon with a good amount of utility.
You already said everything in your post. Seems like a balanced special wall and spreading burns with Scorching Sands is also nice.