About Darkrai, the thing is most of the arguments that people make to imply it's a candidate for a suspect test, are actually aplicable to a lot of mons. And in fact, I think a lot of answers to most of its sets have already been discussed.
But yeah, while you can’t with most mons switch into it without risking a 2HKO -Except Muk Alola cough cough (sorry)- you can say the same about Waterpon, Kyurem, Raging Bolt if you don’t have Bliss/Ting Lu, boosted Gambit aganist most teams, Pult etcetera. And a lot of mons imo get momentum at the same speed of even faster than Darkrai. RMoon, Iron Moth, Gouging Fire… All of them can get easily out of hand.
Darkrai imo is a solid mon, a really good one, but the more I play the least of suspect worthy pokémon I think it is.
It's true that I gave a high number to Darkrai a couple of weeks ago, but the more I play, the more I think I was over reacting to the meta and thinking banning would be useful. I know think it wouldn’t. And while I wouldn’t hate a non-Darkrai meta as I said a couple of days ago (In that case, again, we should unban sleep. And if Lili-H / Val are an issue just ban SP and Hypnosis, Spore mons and Yawn are 100% balanced) I will vote DNB.
I also think that Zamazenta being as good as Gambit and therefore being spammed most of the time makes Darkrai severely weaker. But don’t get it twisted, Zama is not getting used for Darkrai, it’s not a Dracovish-Seismitoad situation. Zama is already a brainless answer aganist physical mons, it stopping Darkrai is just another quality it randomly has.
I think that some Uber mons could be tested instead of banning. If we HAVE to ban, I would look at Gliscor maybe. But I would 10x times prefer a uber test or a Gliscor suspect over a Darkrai one