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Arghonaut looks like essentially the best counter to Swords Dance Rayquaza that ever existed. If Ray isn't running a Dragon-type attack (common), the very best it can do to Arghonaut is unSTAB EQ, which isn't coming close to 50%. Argh can follow up with an Ice Punch to wreck Ray's day. Actualy, Argh might be the reason that Rayquaza won't be found without Outrage in CAP Ubers.
Also, Arghonaut is the best counter ever to CM Ogre not carrying Thunder, as well as Bulk Up Dialga, which it can hit with strong STAB Fighting attacks. It'd also be solid to take a look at how it fares against things like NP Darkrai, which has Focus Blast at best to hit Argh. I'm thinking that Arghonaut is essentially going to be amazing for Stall. Things that usually fuck up Uberstall such as Crogre, CM Gira-O, and Bulk Up Dialga get stopped cold for the most part by Argh. Just watch out for Wobbuffet.
Speaking of Wobbuffet, using Wobb to set up stuff like TG / SD Syclant, CM Stratagem, or start the setup of a Bulk Up Arghonaut could be pretty vicious.
Like others have covered, Syclant's dual STABs make it great in the Ubers metagame. Running it in tandem with Forretress to spin away rocks would certainly be nice, but Mountaineer seems like it could be really good to switch into random Rock attacks and threaten back, such as switching into choiced Garchomp's Stone Edge or SD Groudon's Stone Edge and proceed to threaten with STAB Ice Beam. It's a tossup between the greater power of Blizzard or the reliability and ability to switch in of Mountaineer. Also, Choice Scarf Syclant with Mountaineer seems like it could be a great way to revenge kill all sorts of scary stuff such as DD Rayquaza, any variant of Garchomp, Nasty Plot Darkrai, and offensive Mewtwo (though the CM might make it iffy to take Mewtwo down if it isn't weakened).
Stratagem will probably want to run Levitate in this metagame. The ability to switch into Earthquakes from all sorts of stuff can be extremely useful. It can also switch into SD Rayquaza's Earthquakes and revenge it through its resistance to Extremespeed. Adamant max Attack LO +2 Extremespeed deals 61.06% - 71.96% to min/min Stratagem. Meanwhile, STAB SE Paleo Wave makes short work of Rayquaza. I'm thinking Levitate with CM / Energy Ball / Earth Power / Paleo Wave would be solid. It's a shame that Stratagem doesn't get Grass Knot, because that would definitely be a show-stopper against heavy stuff like Groudon.
Backing Gen in saying that Ankh is just an inferior physical Giratina-O. However, it has the distinct advantages of reliable recovery, unresisted coverage, STAB priority, and not shitting itself when Tyranitar shows its ugly face. The lack of Levitate, lower bulk, and lower power on its attack, as well as the resistances that Dragon provides can be a pain, though. Still, it's hard for Ubers to hit Revenankh SE, making it a lot easier for it to survive. Howerver, Kyogre's insanely powerful STAB Rain-boosted Surf is a terror for it.
Fidgit seems like it may be good as a lead, but its other utility options seem mediocre. Encore seems like a must on it so that Giratina-O doesn't come in, block the spin, and then start setting up for free, something it does against Wish-based Fidgit. Still, it seems like one of the rare counters to SD Lucario in Ubers, which is nice.
If we're thinking about Cyclohm, it really seems like there are way too many stronger Dragon attacks that will prey on its weaknesses. The ability to run Thunder for a stronger STAB attack would be kinda nice, but I see it having issues switching into things.
Kitsunoh seems like it's going to be solid as a Scarfed revenge killer as a way to hit some notable opponents such as Nasty Plot Darkrai, CM Mewtwo, SubCM Giratina-O, DD or SD Rayquaza, and many other things. Unlike standard revenge killers such as Palkia, Kitsunoh does not fear Wobbuffet as much due to its immunity to Counter. However, its mediocre attack and defenses make it potentially a letdown.
Pyroak sucks. It's an inferior Celebi 99% of the time, and it aint getting anywhere near Ubers any time soon. This is especially notable in Ubers, where it is essentially setup fodder for some of the scariest threats in the entire metagame.