Some thoughts:
Nidoking is GOOD. It really does excel at being a core breaker. With Stealth Rock support it is a total nightmare to switch into. In a metagame where we consistently see Clefable and Pex at the top of usage, Nidoking really thrives on breaking down that core and pressuring switchins that try to come in for one of those two mons. It's more than just Clefable and Pex too; many common Pokemon you see on bulkier builds such as Heatran, Magearna, and Tapu Fini are easily taken care of by Nidoking. The ability to pressure a whole playstyle, just like Lando-I was doing (without the brokenness), instantly makes Nidoking a Pokemon you should look at when deciding on a speical breaker. With most switchins already being one predict away from fainting, Nidoking is really just a mon that can provide so much offensive presence for your team, and I've loved using it. It does have its faults in that against faster builds you will really have to find opportunities for it to do much, but even then if you're creating good openings for it to come in like a slow pivot move or Tport then it will be pretty tough for an offensive team to find a switchin. Nidoking has been a pretty great Pokemon and is thriving in this meta.
Dragonite is a more niche pick on bulkier builds but I stayed true to my word and used it and I can most definitely say it is a decent setup sweeper in the metagame. HDB multiscale is so helpful and virtually always guarantees at least one dragon dance bar getting hit with like triple axel and pretty much solves one of the biggest gripes of it in past generations in that it was really easy to break multiscale with rocks. Now that it can use a flying STAB without the unreliability of confusion I've found it to be more effective in actual practice. Something I've noticed is it kind of has 4MSS; Dragonite with DWB, Outrage, Earthquake, Fire Punch, Roost, and ESpeed would be goated but it can only carry three of those due to Dragon Dance taking up a slot. I actually rock with DWB Earthquake and Roost/ESpeed but this sort of issue is kind of solvable through breaking teammates i.e. Nidoking pretty much shuts down a lot of Dragonite's bulkier checks. Seriously, try using this mon, it's kind of fun.
Melmetal is really starting to shine in this meta and it makes sense why. It’s an awesome awesome tank and hits stupidly hard. Something that’s been really cool to me is it has outstanding longevity for an offensive mon with lacking recovery by virtue of its awesome typing and incredible HP. This just in and of itself puts a lot of pressure on opposing teams because once this thing comes in it can usually tank a hit and hit back with an absurdly powerful DIB or appropriate coverage move. In terms of sets, Protect + Leftovers is a pretty solid one and I think it’s the best set Melmetal has in this metagame as Protect allows you to get some leftovers recovery back and scout for mons that may be carrying an extra coverage move for Melmetal. DIB and EQ is already pretty decent coverage and Toxic in the last slot is pretty good for catching Slowbro, Zapdos, and Moltres on the switchin.
:zamazenta-c (it doesn't have a sprite but act like it does): Zamazenta-C would definitely shake the metagame up. I mean I know it's being casually discussed but this is still a mon that would shape up to be a consistent elite but balanced mon in the tier. I agree its best set is probably Howl sweeper and its coverage is definitely above average. I mean, seriously, this thing falls a bit short in Ubers but with BBash/CC/ and either Wild Charge or Ice Fang you're hitting most the tier for neutral damage. Its tremendous bulk probably means it will be able to linger around longer than your opponent wants (shades of Melmetal) and its Speed tier is pretty great as it outspeeds most the metagame. I think the writing is on the wall here - Zamazenta-C would be a solid Pokemon in the metagame and has potential to be a healthy addition to the tier. A big reason I feel like it would be a healthy addition to the tier is that if it were in the tier, it would have a great offensive presence, but would still have a fair share of checks.
Man, this thing has kind of fell off a bit, even without Zygarde. I think we all knew the hype would die down eventually just because in a metagame with a decent selection of Ground types it tends to kind of be a high risk mon in the sense that it’s a complete momentum killer if you bring it in while the opponent still has a Ground type on their team. I know Tapu Koko pairs nicely with it, but outside of that, I just like using Tapu Koko itself more overall because of its access to U-turn That being said, definitely a usable Pokemon in this metagame. When Ground types are taken care of, it is definitely a usable wincon and cleaner and still a powerful fast mon. I think it’s clear though that there’s a reason it’s on less teams than at the beginning of DLC2.
Just like in SM, Landorus-T is back as the leagues best pivot, and it totally makes sense why. Intimidate pivots are always going to have potential to be impact mons in a metagame, and Landorus-T is as good an example as you can ask for. With such a good matchup against a chunk of the metagames physical attackers because of Intimidate and its typing - Excadrill, Garchomp, and the soccer player to name a few - it can force switches and use the switch to set up Rocks or pivot out with U-Turn and grab momentum. It’s really looking like one of the most splashable mons in the tier and I personally find it to be one of the best Pokemon in the tier again.
So yeah, just some things I think about the metagame. This thread is prob one of my favorite on Smogon because the metagame is constantly changing and there’s always something to talk about