Someone willing to rate my Ubers competitive Pokemon team?

Well, I'll try my best to help you. Although I only have made 1 Ubers team (legitly, no RNG, AR, or Pokegen.) and it was Trick Room, so I'm not sure how well I'll be of assistance

I'm actually quite surprized your choice of item on Groudon. I used a Groudon with the exact same move set as yours, and I found Leftovers to be extremely helpful, as Groudon is bulky and can swap into a lot of hits. I'm not exactly sure if you'll be missing out on any kills with Earth Plate either, because his Earthquake can hammer a lot of things.

You said that you can use Roost to heal against non-threatning foes. Can I ask you something? What pokemon ISN'T threatening in ubers that the opponent is going to likely send out against Reshiram? Chansey's toxic will wear you out, Kyogre can beat you with rain support, Jirachi can paralyze you, and Palkia will just straight up kill you. Foretress and Ferrothorn are pretty much the only pokemon that I can think of, but their setting of hazards can hinder your team alot, as even with Excadrill, good luck spinning against Giritina. A lot of counters to Reshiram are designed to just outright kill it, and I feel you'll almost never use roost. I would reccomend Dragon Pulse; to spam something so Reshiram is not completely dead weight should you lose the weather war.

Latias I like. There's really nothing bad about, and I think the set works wonders for your team.

Genesect is a godsend for this team; as you have no pokemon to take Dragon moves otherwise (exca's alright, but its a little slow and risky seeing as he's your spinner). Scarf set with Ice Beam and U-turn is awesome, though I do have to question Explosion and Iron Head. Iron Head is great for STAB, but lets be honest; half the game can use a Choice-Locked steel move as set up bait. This is especially trouble some should the opponent have a Ho-oh; something you're team already struggles with. Nothing on the team can take the Sacred Fire except Reshiram and Latios, and both of those will be hit extremely hard from the Brave Bird. The same could be said if the opponent has a Reshiram. While the argument may be presented "I won't use it then", there's still a lot of pokemon that get free opportunity from Iron Head. Palkia, Kyogre, Manaphy, Blaziken, and Zekrom can all use a free opportunity for this. X-scizzor is a much better spammable, as fewer things resist it. The only real reason I can see Iron Head being useful over X-scizzor is if you want a revenge killer for Kyruem-W, at which point, this entire part of the paragraph can be ignored. Explosion I feel is a waste, as it's not too powerful, but I suppose it can work at times.

I've personally never been a fan of Exca in ubers, but hey, why not? The set you have is pretty simple and get's it's goal done.

Ghost Arceus, is again, pretty obvious. The set you have is pretty much copy-paste smogon.

Alright, to recap

~Groudon's item I feel should be leftovers; I don't think there is any extra kill you get with Earth Plate

~Roost is sorta "meh" on Reshiram, considering how fragile he is and the fact that most of his initial swap ins will cripple, or outright kill, him. Suggesting to replace with Dragon Pulse

~Removal of Iron Head from Genesect; as its set up fodder to a lot of things, and X-scizzor is generally a better spam in the Uber tier. Same for Explosion, possibly getting replaced with Flamthrower or Thunderbolt.

Hope I helped. And remeber, you guys probably know more then I do, so I won't feel offended if you ignor all this.

4 of your team are weak against ice type attacks

3 are weak to ground type attacks.

3 are weak to dragon type attacks

And two are weak to dark type attacks

You want to avoid these kinds of line ups with the same weakness'. If I have a Garchomp EV trained in speed and and special attack with earthquake and dracometeor, I would wipe out your entire team with one Pokemon. Try training a Mewtwo with reflect. You will find it extremely helpful

Yo,your EV's are all over the place/unorganized and so are your move sets. The pokemon party itself is bad.

Check out Smogon.com for how you should put EV's in your pokemon and what moves it should know.

Instead of training them like that just get them from these sites. Pokegen.com or GTS.us

WHERE`S MAGIKARP?!?! LOL perfect team though maybe u could use mew as a tank with protect recover a paraylze move and something else or maybe blisee would be better with it`s broken hp sorry for the crap awnser im just kinda tired

That team is broken but thats how uber teams are i guess.. Um i might suggest adding a rayquaza instead of genesect. Only a suggestion :p

Pretty good