^Honestly, I have to agree with the above guy on the meta being degenerate and too offensive. Right now, if there is a Suspect, I would be voting Ban on almost any offensive threat except Shed Tail, regardledd of the perceived brokeness just to make the meta have less threats. For example I don't consider Volcarona broken, yet right now I would still Ban it in order to have it easier preparing for other big threats. Same for other Mons like Baxc or Iron Valiant.
However, the one unhealthy threat I would be banning for its own impact, is Gholdengo. At this point it not only makes Hazard Stacking the dominant strategy but also forces every team to have at least one Mon that should do the following:
-Be faster than Gholdengo.
-Be able to KO it.
-Be able to still KO it if it randomly Teras into the Flying type.
-Be able to live 2 Shadow Balls from Non Specs sets at least.
-Be able to live one non Specs Make It Rain.
So, in practice this means Balance teams are almost dead. Gholdengo forces teams to either be extremely offensive (not only Hazard Stack, different Weathers, Shed Tail or just random combination of set-up sweepers) or use that one Blissey Stall (extremely passive team).
Yes, we have Tusk to spin, or Treads, but both have 1000 other tasks to do apart from predicting Gholdengo. In fact, defensive Tusk for me is terrible due to not always being able to even kill Ghold, while taking a lot from its moves (offensive one is really good though) . Hawlucha can Defog on Gholdengo, but it does 0 to it and allows Ghold to freely come and use Trick/TW/NP/Specs nuke. Talonflame scares it out too, but it's almost unviable outside of Stall teams.
Of course, saving Balance teams is not really an argument to ban something, but I have a feeling Corviknight specifically has to be a good Mon for the Meta to be healthy. There need to be bulky Mons that check Stuff and at the same time are not passive momentum sinkers for the meta to be enjoyable (at least for me, I know other like a lot just clicking the strongest moves and having 20 turns battles).
This is personal opinion that you can agree or not. I will only be answering to replies/quotes if I think some interesting point is provided, cause if I answered to everyone who disagrees with me, I would spend the entire day writing on this thread.
If you ask me, I think the meta has evolved and learned how to adapt to Gholdy, he's amazing but he has a decent amount of checks in counters (GT, Gambit, Threats, Meows, Gren, Volcarona, Moon, Cinde, Pult, etc). He's meta-defining? For sure because he does what no one else can do but he's not centralizing to the point of saying I need to carry this exact mon to check it because at the end, we always have a ghost, dark, fire or ground type in our team for coverage, not just to take care of it.