tapu koko and lele have been broken along with at least 5 blatantly obvious mons minimum that make this tier incredibly awful to invest any sort of real effort or time in.
Not sure why you post if you are going to say the tier is not worth investing time into. Also, not sure why you would bother to make assertions like this, that clearly are not reflective of the popular opinion or even remotely accurate, without justifying them with any reasoning whatsoever (yea, I am aware you were on phone, but still, I feel like this could have either been avoided completely or saved for a better time if you actually felt it was the truth and had reasoning). With this said, I could not disagree more. The tier has Naganandel, which is clearly banworthy and should go soon, and then it is actually a pretty decent metagame. Do I think 1-2 things could potentially warrant a suspect in the future? Yea, maybe. Does that mean anything is blatantly broken? No. Does that make the tier "incredibly awful to invest any sort of real effort or time in (to)"? Absolutely not, that's an absurd stretch.
--
Here's why I don't think Naganadel is broken
Here's why this is one of the worst posts in this thread.
1. It's frail. Obviously frailty isn't a good excuse by itself, but Naganadel has a typing that provides it with little set up opportunities compared to something like Pheromosa, for instance, Pheromosa had the ability to set up on the most common Pokemon in the tier (Defensive Lando-T), and was literally impossible to revenge kill Speed-wise, your only bets were your own +Spe Scarf Pheromosa, or priority assuming it wasn't paired with Lele.
Ok, let's start here. This is flat out wrong and if you have been assuming this throughout your arguments and playing of the tier, then obviously you do not understand how Naganandel functions or why it is as broken as it is. Pheromosa had 71/37/37 bulk, meaning it died to a lot of priority from very high amounts of health and even uninvested, resisted hits like Earthquake from Landorus-T are doing over 60%. On the contrary, Naganandel has 73/73/73 bulk, which is by no means spectacular, but it allows it to set up often enough and much more than something like Pheromosa -- it can set up on Tapu Koko, Toxapex, Ferrothorn, Clefable, Tapu Bulu, Chansey, Keldeo, Rotom-Wash, Mega-Sableye, Tangrowth, Zapdos, Mantine, Alomomola, etc. and plenty more if you force a switch-out, which is pretty much the only way your Pheromosa set-up ever. It is pretty easy for a Naganandel user to get a free turn to set-up. The only remote "trouble" would be running into healthy AV Tyranitar or SDef Heatran, which is the only defensive counterplay the tier truly has and the means of stopping Naganandel from sweeping.
Naganadel is slower and obviously, it has its own slew of viable Pokemon that are capable of revenge killing it and pressuring it at +1 Spe. A list of some includes Scarf Greninja, which now has new life breathed into its niche instead of just a mediocre scarfer people slapped onto teams for Volc insurance, Granted there's only 2 scarfers (Koko is very borderline for revenging Naga anyway), theres still other methods of Speed control, including Rain, Sand Drill, Hawlucha + ANY TAPU (this one is particularly huge because its so damn threatening to offense and it shuts down so many threats too). There's also more than enough priority moves in the tier that will chip it very quickly and pressure it, this is a lot more obvious when you add in SR, potential Spikes and Sand. To list some of these moves: Mega Lopunny with Fake Out and Quick Attack, Mega Medicham with Fake Out and Bullet Punch, Mega Pinsir with Quick Attack, Mega Scizor with Bullet Punch, Weavile and Mamoswine with Ice Shard, Weavile also has Pursuit to completely remove Naga from play if needed. Zygarde with Extreme Speed, Bisharp with Sucker Punch. All of these moves go a long way in showing how how frail Naga is and how easily it can be picked off thanks to its frailty.
Your list is basically everything that deals with Pheromosa already plus Scarf Greninja -- your whole focal point of this paragraph is grossly misleading given what you follow up with and generally untrue in the scheme of things. Going through this list, the only true consistent RKers of Nagannadel are legitimately Scarf Greninja and Ice Shard users. The others need significant chip, like over 50% of Naganandel's health gone (pretty much every other priority user you mentioned), are things you should not be relying upon for counterplay (Hawlucha + terrain lmao), or do not even do the trick more often than not (Scarf Tapu Koko). Nobody should be convinced by this point at all and your comparison to Pheromosa is invalid.
2. mimimimimimi toxapex is finally manageable, pls don't ban Naga noooo!!!
I mean while having a TSpike absorber for offense is really nice and I will be the first person to agree, but this is absolutely no reason to keep Naganadel in the tier. If something is broken, then you ban it. This means that if Naganandel is an issue right now, it should go, but also that if Toxapex or Regenerator or Toxic Spikes or whatever you might think would be problematic in the future is broken, then we should also ban that. Keeping Naganandel in the tier to provoke some broken keeps broken in check is never ideal and your entire point promotes that idea. Ftr I/nobody else said we will never entertain Toxapex, just not rn w/ other things clearly taking priority. But yea, this point is not doing it for me either.
3. The immediate overreaction to Naga's presence in the tier. This is an odd one, the Pokemon wasn't even released for a day, yet people were claiming it was 100% mandatory to have AV TTar or SpD Heatran to beat it, I've played 70+ ladder games of USUM at 1800+ elo and have not used a single AV TTar or Heatran, this claim is completely false and it's just a case of builder-paranoia which puts everything into a vacuum and can make anything look like a legit threat if you look at it in the right way. I will even provide a list of all the teams I have used so far and can confirm that all of these teams work perfectly fine, despite not having any of the """"mandatory"""" Pokemon required to beat Naganadel.
It's funny because I've played roughly 150 games on the ladder and I feel that if I lack AV Tyranitar, SDef Heatran + removal, or like Ditto Veil, then I am clearly weak to Naganandel and it is not even too easy to play around because if it gets a kill and an NP, then it just fucking wins a ridiculously high amount of the time. The proportion of games this thing sweeps is at an unprecedented high compared to even other broken Pokemon in the tier and it is no fluke, nor builder's paranoia -- it is the fact that there is not sufficient counterplay on either side of the spectrum (offensive or defensive) to Naganadel and the fact that with smart play it can work around even that sometimes (smart play cannot really be assumed or argued, however, so I do admit that there are some games where Naganandel is kept in check).
I find it funny that you're going like "ok look I don't have this problem practically everyone else is and here are my teams to prove it" without actually explaining how you manage to work around it. For example, your first team is weak to Naganadel no matter how you look at it, but it can probably get away with only losing 1-2 Pokemon or so if you play it well with priority, I suppose. The others have actual counters or checks for the most part, but that's the point -- if you don't use one of like Stakataka, which is rare outside of Trick Room and will fall in usage even more as time elapses, AV Tyranitar, which I assume yours are if you don't want to lose to Naganandel, or SDef Heatran, which I also assume yours are, then you can very well be fucked without having much control over things. I think you are legitimately proving my/other pro-ban points by showing these teams, if anything. In addition, I feel like you are trying to gloss over the true issue and just saying "ok here's my perspective and here are my teams and I do not find it troublesome, so listen to me for I have a name and can spread an opinion without justifying it" at this point because I really fail to see how this translates to it not being broken just because you claim it is no problem to you and your teams that pretty much all happen to have Heatran, Stakataka, or Tyranitar.
4. Defensive answers. Albeit defensive answers are a little harder to find due to Naga's immunity to Toxic and ability to blow through all Unaware users, there's still viable options out there, SpD Tran is very solid at limiting Naga, as well as AV TTar (this mon isn't particularly good but it's found a niche in the tier so that's something, just because something encourages something out of the ordinary doesn't mean we should jump the gun!). There's also Chansey which gets off 2 tosses leaving it very weak and Naga doesn't even come out with a guaranteed kill vs it, so interpret that however you want. Ditto has also seen use on bulkier teams, it's by no means mandatory, but it's an extremely good Naga deterrent, and in general is VERY effective in this offense-heavy meta we currently have.
edit: I also forgot to mention Stakataka which is very self explanatory as it can live +2 Fire Blast and +2 DDrake and set up Trick Room in Nagas face or just OHKO it with Gyro, which is a huge deal against most of the teams you'll find Naga on.
Ok, I mean I more or less agree that there are these small handful of defensive answers, but this does not mean it is manageable and the fact that the metagame is so restricted/centralized around them just kinda is a testament to how bad Naganadel is. Also, Chansey needs TWave to actually be a soft-check to Naganandel, but if it has that or is paired with strong enough priority, then you at least cut your losses to 1 Pokemon + getting it RKd or forced out after, which is fair enough (although stall teams often lack those means, which is what the main problem is seeing as Naganandel throws traditional stall in the dumpster).
5. It's one dimensional. Scarf, Specs, and Life Orb are mediocre compared to Dragonium Z, granted they can always pick off random kills with surprise factor despite being bad, this can be applied to any high tier OU Pokemon. On top of this, after the meta has been given time to actually develop a bit, Pokemon are accommodating for it more, things like Keldeo are running Icy Wind more, other things like Natures Madness Bulu is more common and is very nice for punishing Naga considering how freely it comes in (another good point about Naga, it keeps some extremely annoying Pokemon in check like Bulu too). Also, for those that have been playing the ladder lately, you'll be familiar with the ridiculous amount of Trick Room teams on the ladder which generally hinders Naga teams a ton too.
Sorry, but can you please explain why the fuck it matters that it is one dimensional
if the one dimension is clearly broken??? Like shit man, if the Nasty Plot Z-Draco Meteor set breaks the tier, then it should get banned. There's no real care in the world for me how the other sets are, even if I do personally think they lack in comparison (still very viable, just not nearly as ridiculous). I do think the metagame would adapt a bit around Naganandel if it had to, but it would be insanely unhealthy and specific to the point where the tier loses a lot of the diversity, creativity, and variation that we previously were developing a great amount of after the Arena Trap ban. You could argue that gimmicky archetypes like Trick Room and Webs would gain usage, sure, even opening up an outlet for minor innovations, but at the end of the day there will never be a balance or any form of highly competitive tier attained when Naganandel is the centerpiece of just about everything and you have to use one of a very few things or go wayyyyy out of your way from generally optimal means in order to cover it. Your whole plea here is an extension of your Toxapex point, leading me to believe that you just want it in the tier to be a departure from previously established norms. This just isn't how it works, however -- we do not keep things that are broken for the sake of changing the tier up. We ban them and then look to improve the metagame afterwards in order to get the changes we truly do need.
With all that said, I really do not think Naganadel is a broken force in the tier, and rather should be welcomed as a fine addition to the tier, nerfing Toxapex which made the SM meta stale and extremely centralised around it for the longest time, making for a fine buff to offense. I think its sweeping capabilities are weaker than Magearnas, mostly due to the lack of versatility in comparison. Magearna has the potential for 5 different Z-moves in its sets, and 3 forms of set up, and an incredibly useful defensive set too, and has the most powerful scouting punishing capabilities in the entire tier.
With all that said, I disagree with just about every point you made and I think your wanting to keep it in the tier stems more off of avoiding the metagame state we had during late SM as opposed to actually looking to move forward and improve the tier. Perhaps you should be preaching for us to ban Naganadel and then look into suspecting Toxapex afterwards instead of what you're doing now if you feel this way, just a thought.