Had planned to do a more comprehensive post in the near future once SSNL and Trios wrap up either this weekend or next on the teams I've built and some general commentary on mons, sets, and archetypes that have had significant changes in viability since the Xern ban as enough time has passed that there have been some significant changes in the meta in my view. As for the survey results:
Enjoyment / Competitiveness: The degree to which both general and qualified voters enjoy the metagame is around what I expected. There is not any data showing how competitive the qualified playerbase thinks the metagame is though I don't see the score reaching significantly higher than the 7.2 it is currently. We will probably always have a couple of people giving low scores either accidently or because they're trolling which will drag the score down a fair bit since we have a small playerbase. Eledyr entrocefalo and Bobsican have done a great job leading the tier over the last 18 months and have taken an active role in both listening to and involving the playerbase in tiering discussions. Regardless of any frustrations I've with the metagame at various points over the course of the tiers history, that these three and Guard before them (RIP) have been excellent leaders have always meant that there is light on the horizon. Personally, when it comes to balance / competitiveness anything above 7 means the tier is in a pretty good place. It doesn't mean that there arn't things we can change which would make the meta better, but 7 is a good baseline to strive for in a SV tier.
Tera: The qualified response chart is perhaps the most apt way you can sum up how tera is viewed in most SV tiers with every answer being filled except for 5. My answer was a 3 and my feelings on tera are mixed. The metagame would likely be more competitive without tera. Though that isn't really reason enough for me to want to ban something I don't currently view as problematic despite voting to ban it in the past. We also play Ubers which does have a higher threshold for something being considered banworthy and that is before the higher threshold needed to ban a generational mechanic.
I agree with a lot of what BananaTimeZ said above. I don't feel tera is currently problematic. At this point in the meta a random tera type throwing a wrench into things is quite uncommon and frankly I've run into more issues with the occassional Thunder Wave on Ho-Oh than some random tera type. Zacian-C can be a bit silly at times and the coinflip regarding certain defensive teras would be the biggest reason for it to go. Otherwise tera is something I do like in the metagame. I'm completely fine with and would encourage the council to resuspect tera if they feel that there is enough support to merit doing so despite being unlikely to vote to ban it myself.
As a late addendum, I think it would be in the best interest of everyone for any potential tera suspect to happen following another survey in 3-6 weeks. Tera survived its intial suspect in an environment where there seemed to be significantly more opposition to its presence in the metagame than there is presently . If you are advocating for a tera ban it is in your best interest to ensure that tera has a relatively high chance of being banned as there is no guarantee that there will be a third test. I'd be quite surprised if we would be able to do a third test on tera should it survive a second.
Zygarde: The results on Zygarde are not surprising.Though I expected the general response to be higher than the qualified response it is still a little lower than I was expecting given the complaints about it. My position has not changed, it is a mon that is very easy to check naturally when building. Yeah tera means that Ice Beam on your Arceus isn't going to deal with it, but Judgement or just smacking it hard with a special attacker generally will. Zygarde really holds the meta together without being difficult to handle itself. If trapping sets rise in usage and consistency I'd certainly reconsider my position though the idea of a metagame without Zygarde's defensive presence frankly sounds terrible.
Zacian-C: I expected a slightly higher score than it received. I voted a 6 and have been thinking about that since. It both feels a little high and fine at the same time. The decision to vote 6 was more based on I'd be fine with a suspect and I'm not sure how I'd vote. Plenty of people have voiced their discontent publically as well as a couple people privately to me. If we were to suspect test Zacian-C it would be the first test we've had where I'm genuinely unsure how I'd vote at the outset. I don't particularly mind its place in the meta though at the same time I wouldn't be particularly upset if it were to leave. Previously I said I didn't have much of a perference whether Tera or Zacian-C were to be suspected. Currently I'm leaning towards Zacian-C as I'd like to give Tera some more time. That is my personal view and I'm aware that Zacian-C is not being currently considered for a suspect.
Shadow Tag: This result did surprise me. I expected a lot more polarization in the votes and frankly somewhere around a 2 or 3 from the general playerbase. Though I've made no secret of my views on Shadow Tag I unfortunately am quite bearish on it being banned via suspect. Even if the pool of voters for a Shadow Tag suspect only drew from those who responded to the survey, the results don't inspire confidence that it would be banned. We also have players who would qualify to vote for the suspect test who have not responded to the survey and it would be foolish to assume that they would overwhelmingly vote to ban it. Furthermore, every suspect attracts people who view the test as nothing more than an easy way to accumulate suspect votes on the way to a badge. These people do not touch the tier otherwise. Their votes are, of course, valid. I'm not suggesting otherwise or that this should be changed.
The reason I bring this up is that over the course of a suspect test you ladder up to 1550-1600ish. Anyone that has spent the bare minimum of time on the NDUbers ladder is well aware that the teams that one would encounter over the course of laddering is wholly divorced from the actual metagame. This is something of an issue for any suspect in NDUbers, but substantially more so with a Shadow Tag test.
The ladder is largely isolated from the negative effects Shadow Tag has on the metagame by virtue of Gothitelle being largely absent. This is a substantial difference from previous suspects as the effect that Tera, Koraidon, or Xerneas have is readily apparent. Unless one was to use a Gothitelle team themselves the chances of them running into it over the course of getting reqs is close to nil. Additionally, Gothitelle itself is likely to be underwhelming as unless you run into someone else getting reqs the chances of loading into more than a couple of good teams is astonishingly low. This leads to a misconception about what Gothitelle is actuallly capable of doing as it likely isn't going to do much of anything against the anime or persons favourite mon that happens to be an Uber + 5 NDUU mons teams that make up the majority of opponents during a suspect run. I don't want this to give off the impression that anyone who thinks that Shadow Tag should remain in the tier is a moron. For example, adem and I have discussed Shadow Tag and we disagree about whether trapping is inherently unhealthy. Though we disagree about whether Shadow Tag is banworthy I can understand that viewpoint.
I'm appreciative that Shadow Tag was included in the survey to begin with. It just kind of blows that I cannot shake the feeling that should the council decide to proceed with a Shadow Tag suspect that it is highly unlikely to get enough votes to be banned. I'm not aware of any alternative routes we would be able to take that comply with general tiering policy. A quickban or council vote is obviously out of the question. My ideal suspect would be some high ladder rating combined with a high gxe though that obviously does not jive with tiering policy.
Last Respects: I've only ever advocated for a Goth / Shadow Tag ban rather than trapping as a whole since the Arena Trap mons are horrible despite trapping being inherently unhealthy. The same applies to Last Respects. Basculegion simply just isn't there yet and currently is largely a matchup fish. If meta developments result in it becoming semi consistent I'm happy to chuck it out. It doesn't add anything positive to the tier, but it doesn't presently harm it.
Enjoyment / Competitiveness: The degree to which both general and qualified voters enjoy the metagame is around what I expected. There is not any data showing how competitive the qualified playerbase thinks the metagame is though I don't see the score reaching significantly higher than the 7.2 it is currently. We will probably always have a couple of people giving low scores either accidently or because they're trolling which will drag the score down a fair bit since we have a small playerbase. Eledyr entrocefalo and Bobsican have done a great job leading the tier over the last 18 months and have taken an active role in both listening to and involving the playerbase in tiering discussions. Regardless of any frustrations I've with the metagame at various points over the course of the tiers history, that these three and Guard before them (RIP) have been excellent leaders have always meant that there is light on the horizon. Personally, when it comes to balance / competitiveness anything above 7 means the tier is in a pretty good place. It doesn't mean that there arn't things we can change which would make the meta better, but 7 is a good baseline to strive for in a SV tier.
Tera: The qualified response chart is perhaps the most apt way you can sum up how tera is viewed in most SV tiers with every answer being filled except for 5. My answer was a 3 and my feelings on tera are mixed. The metagame would likely be more competitive without tera. Though that isn't really reason enough for me to want to ban something I don't currently view as problematic despite voting to ban it in the past. We also play Ubers which does have a higher threshold for something being considered banworthy and that is before the higher threshold needed to ban a generational mechanic.
I agree with a lot of what BananaTimeZ said above. I don't feel tera is currently problematic. At this point in the meta a random tera type throwing a wrench into things is quite uncommon and frankly I've run into more issues with the occassional Thunder Wave on Ho-Oh than some random tera type. Zacian-C can be a bit silly at times and the coinflip regarding certain defensive teras would be the biggest reason for it to go. Otherwise tera is something I do like in the metagame. I'm completely fine with and would encourage the council to resuspect tera if they feel that there is enough support to merit doing so despite being unlikely to vote to ban it myself.
As a late addendum, I think it would be in the best interest of everyone for any potential tera suspect to happen following another survey in 3-6 weeks. Tera survived its intial suspect in an environment where there seemed to be significantly more opposition to its presence in the metagame than there is presently . If you are advocating for a tera ban it is in your best interest to ensure that tera has a relatively high chance of being banned as there is no guarantee that there will be a third test. I'd be quite surprised if we would be able to do a third test on tera should it survive a second.
Zygarde: The results on Zygarde are not surprising.Though I expected the general response to be higher than the qualified response it is still a little lower than I was expecting given the complaints about it. My position has not changed, it is a mon that is very easy to check naturally when building. Yeah tera means that Ice Beam on your Arceus isn't going to deal with it, but Judgement or just smacking it hard with a special attacker generally will. Zygarde really holds the meta together without being difficult to handle itself. If trapping sets rise in usage and consistency I'd certainly reconsider my position though the idea of a metagame without Zygarde's defensive presence frankly sounds terrible.
Zacian-C: I expected a slightly higher score than it received. I voted a 6 and have been thinking about that since. It both feels a little high and fine at the same time. The decision to vote 6 was more based on I'd be fine with a suspect and I'm not sure how I'd vote. Plenty of people have voiced their discontent publically as well as a couple people privately to me. If we were to suspect test Zacian-C it would be the first test we've had where I'm genuinely unsure how I'd vote at the outset. I don't particularly mind its place in the meta though at the same time I wouldn't be particularly upset if it were to leave. Previously I said I didn't have much of a perference whether Tera or Zacian-C were to be suspected. Currently I'm leaning towards Zacian-C as I'd like to give Tera some more time. That is my personal view and I'm aware that Zacian-C is not being currently considered for a suspect.
Shadow Tag: This result did surprise me. I expected a lot more polarization in the votes and frankly somewhere around a 2 or 3 from the general playerbase. Though I've made no secret of my views on Shadow Tag I unfortunately am quite bearish on it being banned via suspect. Even if the pool of voters for a Shadow Tag suspect only drew from those who responded to the survey, the results don't inspire confidence that it would be banned. We also have players who would qualify to vote for the suspect test who have not responded to the survey and it would be foolish to assume that they would overwhelmingly vote to ban it. Furthermore, every suspect attracts people who view the test as nothing more than an easy way to accumulate suspect votes on the way to a badge. These people do not touch the tier otherwise. Their votes are, of course, valid. I'm not suggesting otherwise or that this should be changed.
The reason I bring this up is that over the course of a suspect test you ladder up to 1550-1600ish. Anyone that has spent the bare minimum of time on the NDUbers ladder is well aware that the teams that one would encounter over the course of laddering is wholly divorced from the actual metagame. This is something of an issue for any suspect in NDUbers, but substantially more so with a Shadow Tag test.
The ladder is largely isolated from the negative effects Shadow Tag has on the metagame by virtue of Gothitelle being largely absent. This is a substantial difference from previous suspects as the effect that Tera, Koraidon, or Xerneas have is readily apparent. Unless one was to use a Gothitelle team themselves the chances of them running into it over the course of getting reqs is close to nil. Additionally, Gothitelle itself is likely to be underwhelming as unless you run into someone else getting reqs the chances of loading into more than a couple of good teams is astonishingly low. This leads to a misconception about what Gothitelle is actuallly capable of doing as it likely isn't going to do much of anything against the anime or persons favourite mon that happens to be an Uber + 5 NDUU mons teams that make up the majority of opponents during a suspect run. I don't want this to give off the impression that anyone who thinks that Shadow Tag should remain in the tier is a moron. For example, adem and I have discussed Shadow Tag and we disagree about whether trapping is inherently unhealthy. Though we disagree about whether Shadow Tag is banworthy I can understand that viewpoint.
I'm appreciative that Shadow Tag was included in the survey to begin with. It just kind of blows that I cannot shake the feeling that should the council decide to proceed with a Shadow Tag suspect that it is highly unlikely to get enough votes to be banned. I'm not aware of any alternative routes we would be able to take that comply with general tiering policy. A quickban or council vote is obviously out of the question. My ideal suspect would be some high ladder rating combined with a high gxe though that obviously does not jive with tiering policy.
Last Respects: I've only ever advocated for a Goth / Shadow Tag ban rather than trapping as a whole since the Arena Trap mons are horrible despite trapping being inherently unhealthy. The same applies to Last Respects. Basculegion simply just isn't there yet and currently is largely a matchup fish. If meta developments result in it becoming semi consistent I'm happy to chuck it out. It doesn't add anything positive to the tier, but it doesn't presently harm it.
(Lebernatus Horse)
(Specs Lunala Balance)
(Knock Ferro Dragon Fang Eternatus Hstack)
(DD Ground Dtail Hstack)
(Updated ZNDM BO V1)
789 Chalice Load
Timid 32 HP / 8 Def / 240 Spa / 8 SpD 220 Spe is my current gold standard spread on LO YV. The only real downside is being outsped by Lunala, which of course Squeeby happened to bring twice the first time I loaded this in seasonals
... I don't have an issue with Timid as I've always viewed Knock Off as a utility move v fat and stall so the minor power drop is fine and have not found a calc where the 12 SpA EVs matter so far. In return you get a LO Yveltal that lives a lot of shit it shouldn't. It survives defensive Primal Groudon Overheat after one round of LO chip. It survives uninvested Arceus-Fairy Judgement after one round of LO chip and beats Bold sets if they switch in on Oblivion Wing which shouldn't be possible. It survives CB Ray Dragon Ascent. It survives defensive Primal Kyogre Ice Beam after Stealth Rock and one round of LO chip. It also always wins the mirror It also survives +1 Zacian-C Wild Charge which is quite nice for Tera Flying variants which I'm liking more and more. It is true that Tera Dark is a nuclear breaker, but LO Yveltal is already a nuclear breaker without tera and Tera Flying makes those Oblivion Wings really pack a punch while keeping Yveltal healthier. I also learned while writing this that this spread also survives Choice Specs Lunala Moonblast, just another reason why it is great.
It is the destroyer of balance and a lot of teams in seasonals/trios, including my own, just get absolutely smoked by offensive Primal Kyogre. It has some issues v HO, but those can be addressed in the builder and it is well worth supporting. I have not built it yet, but Alo+ Primal Kyogre seems like it would be a lot of fun with something like Marshadow for HO. Defensive sets are still amazing, but if you are building a balance w/o Ferrothorn you likely do not have a solid offensive Primal Kyogre check.
The metagame seems to be simultaneously trending towards both HO and fatter balance, both playstyles that Marshadow matches up very well into. Some people claim that CB Marshadow is great into stall, but I've never been able to make that work. Marshadow is better atm than its been in a long time. CB A+ / BU LO A- / AOA B-. AoA only works because Marshadow itself is good imo and combines the worst parts of both CB and BU LO.
Yveltal plays a huge role in why I'm so high on Arceus-Fairy at the moment. Having an actual defensive switchin to that beast is such a relief in the teambuilder. Normally I go with 248 HP / 164 SpD / 96+ Spe with some utility spread. It is still the only Arceus form I like rocks on. If / when I join another tournament maybe I'll give CM + Gothitelle a go because it feels like it would either be inconsistent or way more effort than it is worth without Gothitelle support and Arceus-Dark as a better standalone wincon. Lately I've been using defensive Primal Ground + Ho-Oh + Tera Water Zygarde + Tera Dark Arceus-Fairy as a core and it really feels like you can plug that + almost any two offensive mons and it will probably work. Tera Dark Arceus-Fairy covers pretty much everything you'd use Arceus-Dark for except SD Primal Groudon which Zygarde handles. I nommed it for A[1] but the bottom of A+ seems alright as well.
No one should be surprised that Giratina-O is better post Xerneas. Special and Defogless sets are better than ever, but physical sets are just kinda ass. It seems nice on paper, but then you look at the metagame and you have a strongish (that is being kind) that kinda loses to everything while being forced into Toxic. Toxic isn't had but when you're forced into it because you lose to mons that you should be beating such as Primal Groudon and Zygarde it becomes an issue.
Lunala, at least Specs sets, have only gotten better since the Xerneas ban. Yes, Yveltal and Marshadow have generally improved as well, but that doesn't really hinder Lunala at all. Neither really want to switch in and Lunala's weakness to them is so severe that sturdy answers, usually Arceus-Fairy and Zygarde, were already required. Normally I'd say requiring two mons for support should heavily count against a mon, but these are mons that would probably be considered anyways and heavily appreciate Lunala's ability to threaten every Eternatus set.
I thought about nominating this to B+ on the VR post, but decided against it. Ferrothorn itself and bulkier spikestacks are quite good at the moment, but I'm not sure if Ferrothorn itself is splashable enough. The tranqulity that comes with not having to worry about Primal Kyogre is certainly something I could get used to. Defensive Primal Kyogre generally isn't too terrible for balance teams to deal with but offensive sets are a terror. Primal Groudon is only a good check when your opponent greeds and doesn't click Ice Beam. The issue is that Primal Groudon is still better than almost anything else. Ferrothorn doesn't love taking 150 BP Water Spout, but it does take it well enough to function decently well after. Power whip does enough damage to force Primal Kyogre to respect it and makes staying in an actual risk while also covering Alomomola and Arceus Ground/Water.
Caught Slipping
The title seems a bit harsh as Arceus-Ground hasn't had a big tumble, it is just slightly worse. Arceus-Ground is a mon I view as a jack of all trades master of none. There is usually some set that fits whatever team I'm building, but far more often than not some other Arceus forme is a better fit. If I want a defensive lean from my Arceus forme, Fairy and Dark tend to provide better support to whatever mon I'm building around. This applies to CM sets as well. I do quite like physical sets and those slot in very well as an offensive presence that still provide a decent amount of defensive utility.
I oscillate between feeling that Zacian-C hasn't been that negatively impacted by Xerneas' departure and that it is significantly worse, currently I am heavily leaning towards the latter. Zacian-C is still unquestionably one of the best mons in the metagame, but it is so much easier to handle defensively. During the Xerneas meta these two worked in tandem to easily overwhelm their shared checks and enable the other.
Arceus-Dark is still a fantastic mon, but it has consistency issues that have lead to me perfering other Arceus formes more often than not and a lot of this stems from the ubiquity of LO Yveltal. During the Xerneas meta I had a preference for Wisp over Toxic. Toxic is more consistent on a game to game basis, but Wisp is a lot better into the HO teams that Arceus-Dark was on the team to help with. This is a much larger issue in the current day as Arceus-Dark is a Dark-Resist that loses to LO Yveltal without Toxic, but is much worse into HO without Wisp. Even with Toxic, Arceus-Dark has additional issues. Bold Arceus-Dark is forced to attempt to Toxic Yveltal on the switch and is liable to be kept low throughout the match which makes it easier for mons such as Ultra Necrozma to find a way to break through eventually. Timid solves the Yveltal issue, but Arceus-Dark becomes a signifcantly less sturdy check to SD Primal Groudon, one of the few reasons I'd use it over Tera Dark Arceus Fairy. R8 said that dual status was decent, but I've never used it myself and am a little skeptical since without Taunt Arceus-Dark has no means of maintaining progress against fatter balance and stall teams nor a way to keep itself free of status outside of tera.
I nommed this to drop to B+/B in my VR post and the more I think about it, even this feels rather high. In a vacuum MMY is a great mon, but outside of that whenever I try and build with it I'm always left wondering why I'm having to spend so much effort to enable MMY to do its thing relative to other breakers. It suffers from the attention Ultra Necrozma demands in the teambuilder as all the hard checks / counters for Ultra Necrozma work for MMY. It also suffers from Xerneas' departure as this has lead to a less centralized metagame which only exacerbates MMY's 4MSS.
There are a few things I'll be paying attention to when it comes to Arceus over the course of the tournament. First is Arceus-Ground specifically. Arceus-Ground is generally viewed as the best overall Arceus forme. This isn't something I wholly agree or disagree with, though I've been leaning towards the latter. Arceus-Ground's viability stems in large part from its set versatility. Whilst I do not view any Arceus-Ground set to be as potent as its S-[1] VR rank would suggest, there is nearly always some set that probably fits reasonably well onto your team. Conversely, while any good team can generally handle Arceus-Ground, there is also probably some set that puts in work into your team. It is a jack of all trades, master of none type of Pokémon, which is both a boon and a curse. Although being generally good is great, I often find myself wanting more security against certain threats defensively that Arceus-Ground is able to provide relative to other Arceus formes. Accordingly, I don't find myself using Arceus-Ground as often as I could. I'll be paying attention to how often Arceus-Ground is used and how effective it is. After all, a Pokémon which derives a signficant portion of its viability from its ease of use should be used and this will be something I'll factor in on the next VR slate.
I don't think Gothitelle will see a ton of use, but I'm keen to see what it does when it is brought. Shadow Tag is broken and it is far better in a tournament setting than ladder where you don't have to account for such a wide range of tomfoolery. I'm hoping it puts on a show (against someone other than me), but I also think it is a lot more likely to pick up usage in NDPL rather than the Open.
Deoxys-S dropped in the recent VR update and my reason for doing so was due to the competition it faces from Glimmora. I still think Deoxys-S is often the better choice for Hstack HO, but it'll be interesting to see what HO enthusiasts decide to bring.
It is a pretty cool antimeta Pokémon, but I'm not expecting to see it more than a handful of times, if at all. It'll be interesting to see someone give a new spin on Garganacl. 
Adem has converted Bob into a Chien-Pao believer. Same thing as Garganacl, if it is brought I'll be keen to see if it can put in work. Choice Band is pretty good, but I'm still skeptical of Swords Dance.
I'm sure it'll make its way into a couple of games. I think it has B- potential, but wanted to see it do more than it has. This is a chance to show off what it can do. Landorus-T strikes me as a mon that will be somewhat common in NDPL, but I'm not sure if it will be in the Open.
Pheromosa (only needs Tera Ghost in maybe 5-10% of games)
Mega Mewtwo Y
Mega Mewtwo X
Mega Diancie
is functionally always part of this list)
, 
Dondozo
| 
This is a set I sometimes enjoy using with Stealth Rock Arceus-Fairy and Alomomola. It can work without Alo, but functions so much better with Wish support. This is a weird set, but one I have used before and have been using with increased frequency. The SpD EVs make defensive Primal Kyogre's Ice Beam and 4HKO and allow Primal Groudon to survive offensive Arceus-Ground Judgment after Stealth Rock as base Primal Groudon. The speed is to outspeed paralyzed Zacian though it could go slightly higher as the Atk EVs are largely a dump.
Bog standard Zygarde. Tera Poison or Dragon Dance might work on this squad. It is mainly there to wall physical things and provide speed control with Glare. It can be a wincon, but it really is here to support the team.
Alomomola is what allows the team to work. Giving Primal Groudon and Giratina-O a second wind allows them to be played so much more freely. Pivoting is also great and is the reason why I won a couple of games. Alomomola is great at bringing your breaker at least once and more, especially against fatter balances. It is somewhat restricting as it wants a decently SpD Arceus-Fairy or Dark For Yveltal. Not an issue because they're great, but Yveltal will be a big threat without those.
Ol Reliable #2. Does the same shit as always. Just because it is less used does not mean it is any worse. If anything it is more effective at soft checking half the metagame and providing all that role compression.
I hadn't used Calyrex-I in forever and wanted to. It is still really good, but is support reliant. Not something to just stick on a team. It hits hard enough that it can be used to tera defensively to help patch up a bad matchup against some threat if needed. It is far better to support it defensively and it can provide defensive support against fatter teams via the threat of Glacial Lance or from utility options. This could be Seed Bomb given how annoying offensive Primal Kyogre can be. Shoutout to Adem for suggesting Tera Fairy after I had talked about Tera Dark over Steel.
I wanted to see if it could fit and it sort of does, but could be replaced. It combines with Calyrex-Ice to ensure that support Arceus-Formes are of little concern and is quite nice at drawing out some teras. It is usally a midspeed breaker that outpaces the cluster of defensive Pokemon by hitting 331 Speed at +1 and unleashing a Z which is very hard to wall. Photon Geyser could be used here as well. The EV spread can likely be further optimized to live some hits. The bulk is generally enough to get of one Dragon Dance, but rarely two. It is a fun mon.
.
This really comes down to respecting it in the builder. Do that and it should generally be fine, don't and it is going to a demon. Fortunately, it isn't just Arceus-Dark, Marshadow, or Yveltal. I've used Coil Zygarde + Tera Dark Arceus-Fairy a lot which works well. Ditto revenge kills it and Alomomola can Tera Dark and Toxic stall if needed. There are a lot of ways to go about handling Ultra Necrozma, but relying on a flimsier method of dealing with it is going to lead to getting swept a lot.
Shadow Tag is uncompetitive and has an unhealthy effect on teambuilding. Gothitelle is near deadweight against HO, the main exception being the mon above it. Having to dedicate a slot or two to HO happens on other teams and isn't a huge deal given how well the top mons compress roles.
This is a placeholder for stall. Stall is not very good, nor is it hard to beat, although it should still be respected. Fitting the tools to handle stall are not hard to find, especially on balance and BO teams. Outside specific types of HO prepping for the stall matchup is easy and it is often not worth greeding to ignore it. Just having the tools is enough so long as you arn't overzealous in wanting to end the game.
(Offensive) Usually my teams handle defensive Eternatus sets without a ton of issues. Offensive Eternatus is one of those threats that can sneak up on some slower balances.Handling it offensively can be difficult as it'll often claim a KO, but it can reasonably be forced out or revenge killed after. Bobsican and Big Baurens were using Teleport Blissey on semistall and fat builds which was interesting. Being alright against offensive Eternatus doesn't take a ton, but it is better to fill that earlier on.
Entro and I think Sami brought DD Rayquaza on HO. Someone else may have, but I don't recall and can't be bothered looking through 100 replays. DD Ray on Webs is incredibly scary and should be brought more. Ray is already a nuke then add +1, a LO and it can finish games or leave damage that can't be recovered, and that is before tera. It is a threat that should see a bit more use than it does. Band is still an amazing wallbreaker and though I havn't used it in a bit I really should. That speed tier is good, but not great. It is one of those mons that keeps fat somewhat honest. Being the slowest of the fastish breakers isn't ideal, but it is also the most immediately scary of them.
Bob
To the chagrin of many, not only is Garganacl viable, it is good. For a long time it oscillated between viable and usable, something you'd run into on occasion, but rarely. In June it was almost Ubers by usage at 1760+ with 4.2% usage in June. Ladder stats don't mean much, but it is quite notable. I don't think Garganacl is a passing fad, but I'm interested to see if it is at the apex of its viability. It strikes me as a mon that will see more usage and experimentation in NDPL and I'm keen to see how it performs there. I view it as a B- mon currently with B potential.
The pink blob have long been relegated to stall teams. Bigbaurens in the Open as well as Bobsican on the ladder have been using Teleport on fat balance and semistall. I don't know if one was inspired by the other or if they came up with the idea independently, but it is one that I like. If either he or BigBaurens would like to weigh in that'd be fantastic.
Shyamin-Sky, Slurpuff, and Urshifu list among the tomfoolery that was brought more often than Mega Diancie. Usage stats and win rate don't mean much of anything, but I am really surprised it has only been brought once. A lot of people have brought HO and I'd have thought that a couple of the people would consider bringing it. Not only does it have a stellar matchup into HO, but it is genuinely annoying for a lot of balances to play around. I'm mostly bringing this up to say that if you havn't tried Mega Diancie, you should give it a go and it is a lot better than you think.
GET DRAPPLED. Shocker that the Appletun pfp is a Hydrapple fan. R8 has mentioned that NP has potential for a while and and BigBaurens built around an AV set. Meming aside, I do think it may be able to eek out some sort of niche and is just a cool mon. In a metagame where Zygarde, and to a lesser degree, Primal Kyogre are as strong as they are, a lot of Grass-types can probably do something.
Tangrowth and 
Amoonguss), namely its Dragon STAB can annoy 
Mega Venusaur was unranked out of seemingly having no niche, but as I began to explore it, I noticed that while rather situational, its good mixed bulk and neutrality to Ice and Fire thanks to Thick Fat lets it perform some interesting role compression at checking the combo of 
Arceus-Grass).
Cyclizar's Shed Tail is a rather well known utility move as it can simplify a lot the lead game, as with a Choice Scarf it outspeeds the entire unboosted metagame, but what has made me notice it may have some extra potential is the fact that 
Lugia or 
Dragonite, as well as Tera Shell from 
Terapagos, but those are still too underpowered to justify under the current metagame.
Blissey independently of BigBaurens, looking back, it's weird that it wasn't experimented on for this tier already when Teleport 
Chansey).