All sticky teams have this fundamental flaw: it relies on sticky being up. Sticky pokemon cannot 100% prevent defog. Defogging at the cost of losing the defogger is almost always worth it, since it shatters sticky teams' underlying necessity of speed manipulation. IMO, all sticky teams in existence are bad because of this inherent fact, and it is the fundamental flaw of sticky teams. I loved the gimmick of double dragon tho.
I really like Thugly Duckling's team. Tailwind support to check Geomancy Xerneas is genius. I think that you should have U-Turn on Tornadus. I'll explain more later on. And, I agree with Hack's suggestion of changing sableye to gengar strongly. Sableye is an defensive pokemon on a HO team which stops your momentum. It also gives opportunity for strong special attackers to switch in and kill 1-2 mons on Sableye. If I was you, I would resubmit/edit the team with Gengar before the deadline. Also, the other thing that I thought was cool about this Tailwind strategy: it's very hard to stop the tailwind. The only possible thing to stop it in Ubers is a taunt from speed-tying Thundurus. You can't defog Tailwind away. You can suicide Tailwind, or Tailwind then pivot with U-Turn into your team which has a good variety of resistances. These 3 turns can easily cement your victory, and your opponent literally cannot stop it from happening. What a great idea.
Psyceus team: I disagree with Hack's suggestion that Pursuit is unnecessary. He has a resstalk cm xern, which is very Gengar weak. It's a good win con vs stall and balance teams. However, Gengar is able to stop it very easily, and this is where Pursuit comes in the play. I don't quite like this team, but I can't really put the finger on it. I just feel like you prioritized the defensive backbone much more than offensive one. Maybe, you could try and restructure the team to be more offensive inclined? Also, Scizor, Ferro, and SpD Kyogre all on the same team feels very redundant. You probably can get away with replacing Ferro or Scizor with something else.
I really dislike Hack's poisonceus team. Poisonceus and Ho-Oh has a really conflicting synergy together. Ground types makes it very difficult for Poisonceus to immediately defog. Additonally, Poisonceus and Ho-Oh have practically the same defensive backbone. It's just very redundant. Not to mention that there's already SpecsOgre, so band Ho-Oh for stallbreaking is entirely unnecessary. Also, the team strikes me as very Ho-Oh weak, and rock slide lure on Xerneas is adorable, yet very predictable based on preview. Also, Ho-Oh lives scarf rock slide, so there's very minimal gain from this, and Ho-Oh can easily get hp back on Poisonceus. I think that changing poisonceus into Fairyceus and swapping xern for a Zekrom would be a better team. You have specsogre and cb Ho-Oh to nuke Zekrom's checks and become stronger vs Ho-Oh. And, for Fairyceus, I would recommend a specially defensive spread with Roar to deter Gothitelle and phazes Xerneas in a pinch.
TR team: I think that you should change scarf xern to aroma geoxern. Geoxern is initially slow, so you can use it under tr and overpower some threats if necessary. Also, it's much better vs cm arc and can win vs them.
Flyceus team: I think that smooth rock would be better than tyranitarite on that team, since it's very based on using exca's sand stream. It would give you an extended opportunity to use Excadrill's power. The team feels very ground and ekiller weak, but it's unavoidable due to ttar+exca structure. Klefki only adds to it. A fix is to change Kyogre to physically defensive, since you already utilize ttar and klefki as specially defensive backbone. This will give you a reliable ground check and check for ekiller. I think that flyceus is a suboptimal pick, but it works so why not.