It's pretty evident that Calyrex-S is the most talked about CT Uber now, and it's not hard to see why, especially on;
HALLOWEEN
While I personally say that there is more of a problem with Dynamax being unrestricted, and Calyrex-S is excellent but not close to AG worth (come talk to me when it gets Quiver Dance, a Special Extreme Speed, and As One starts canceling weather+reduces its weaknesses).
What isn't talked about is its wide movepool. It seems like everyone wants to just run Nasty Plot+3 moves (2 of those moves always being Astral Barrage and Psyshock). As a king, I think that doesn't do Calyrex-S justice to be pretty linear. There of course is nothing wrong with a good old NP 3 attacks set, but Calyrex gives Spectrier a much wider movepool which can help cover its weaknesses.
Probably one of the most useful status moves other than Nasty Plot will be Substitute. Because of it's 100/80/100 bulk, it's x4 weakness to Sucker Punch and Shadow Sneak, it still being slower than most weather abusers, and well Ditto just outright stealing Calyrex's identity, it's actually pretty risk to use and can be forced out in many scenarios, leaving its teammates to take the brunt of what ever was meant to hit Calyrex-S.
Substitute, at the cost of coverage or Nasty Plot, can alleviate the problem of revenge killing, as well as many other things that will ruin Calyrex's day. Aside from allowing Calyrex-S from to stay in longer with good prediction, it also prevents most status moves from hindering Calyrex-S or your teammates greatly, such as when a Tyranitar predicts Zacian-C will come in and uses Thunder Wave, thinking either target being paralyzed can ruin your core. Sub isn't just for protecting Calyrex-S in offensive sets either. With the rest of its movepool, it can play more like a Stallbreaker instead of a Wallbreaker.
Will-o-wisp is next on that list. With so many Physical attackers running around, most of which have no burn immunity, Calyrex-S can easily ruin some of the scariest Pokemon. Thanks to it's 150 Spe, it can outspeed base 95 Scarfers and of course Zacian-C. In addition, you also power-up Hex, which is even stronger than Astral Barrage and has double the PP. Also in addition, it turns Foul Play from an a near OHKO into a 3HKO (that is with HP investment vs standard Calyrex without investment).
Taunt is another great tool for both offensive and defensive sets. Preventing healing, hazards, defog (and also Rapid Spin), status, trick room, setting up, and more is always a valuable asset, especially on a Pokemon with its speed. It's great.
Trick is another type of set I'v heard earlier, which can cripple most oncoming threats, but can only work once and it doesn't really solve some of its switch-ins.
Leech Seed in conjunction with Sub sets can be a devastating combo with Calyrex-S's speed tier once Marshadow and any grass type is dealt with. Leech Seed can also be used on its own for Calyrex-S to chip at its checks while healing off Life Orb Recoil.