Petrie, most Bulky Waters (like 99%) of them aren't running Special Defense.  If they were, they aren't "bulky" anymore.  Sure, Vaporeon and co. can start going Special Defense, but then Gyarados has fun and walks all over them.
				
			The types of moves the Lati twins can use (specially) are Dragon, Psychic, Electric, Ice, Grass, and various Hidden Powers. The Lati twins are hardly lacking in coverage.I don't see why testing L@ti twins in OU without Soul Dew would be a problem.
IMO, they lack type coveragez in their attackz.
I don't see Latias being any problem at all and in fact I think she would be good for the metagame, serving as a great Mixape, Skymin, Offensive Zapdos, and Heatran counter. Tyranitar puts a major major strain on Latias making her life very hard, either forcing her to carry a specific move for him, greatly limiting her versatility, or else risk instant death to CBPursuit or Crunch. Scizor and Metagross are similar cases and make things even more complicated as they require a different move to take care of (although I suppose Reflect could feasibly cover all three). This crippling pursuit weakness I think makes Latias almost a non-issue, and I feel almost guarantees her into OU
Latios I'm a little torn on because I feel he may, as imperfectluck said, centralize the metagame too much around steel types, namely Bronzong, Scizor, Heatran, and Metagross; however, he too shares Latias' Pursuit weakness and to an even greater degree with his weaker defenses and propensity to use Draco Meteor and cripple his SAtk, forcing him to switch out. I can definitely see Latios fitting into OU though; I have no doubt he would probably be a major force and significantly change up the game, but I don't know if that's necessarily a bad thing. I could see this going either way really.
Thunderbolt is for EMPOLEON not nessecarily other water types.
Thunderbolt sounds good in theory, but is really not needed tbh. Its in the same boat as Psychic as far as letting Tar in, but Thunderbolt really doesn't gain anything. You won't be using it early game anyway, and everything except Empoleon that you hit with Thunderbolt you will Draco Meteor for more damage. Electric is a decent attack type but Ground is immune, and its a weak option otherwise. Dragon Pulse and Psychic outclass it.
Modest Choice Specs Draco Meteor vs. 252 HP Suicune: 83-98%
Modest Choice Specs Draco Meteor vs. 252 HP Gyarados: 95-100%
Modest Choice Specs Draco Meteor vs. 188 HP Vaporeon: 88-100%
Modest Choice Specs Draco Meteor vs. 252 HP Milotic: 80-94%
So um, why do I need Thunderbolt again? If Draco Meteor is doing that much, Dragon Pulse / Psychic is surely 2HKOing all of them as well. Lets check:
Modest Choice Specs Dragon Pulse / Psychic vs. 252 HP Suicune: 53-63%
Modest Choice Specs Dragon Pulse / Psychic vs. 252 HP Gyarados: 62-73%
Modest Choice Specs Dragon Pulse / Psychic vs. 252 HP Vaporeon: 56-67%
Mdoest Choice Specs Dragon Pulse / Psychic vs. 252 HP Milotic: 51-60% (86% chance to 2HKO w/o SR)
Yeah and if we are testing Soul Dew, these values apply without the Choice of moves :-(
Then again I got to ask, why modest specs? They have the same speed as Gengar, and gengar almost always runs timid except for scarf. I don't see why lati@s wants to lose their 1 big advantage of outrunning mence/flygon. Jolly CB flygon/mence and even +speed mixmence are not uncommon you know.
I base myself on battles i have seen not on 'pointless' theorymon. The reason why i am certain is because of the current phylosophy and therms people ban things around here. If something is even just a little too powerfull compared to the top 10 pokes, people will vote it to uber.But whenever your team couldn't outspeed and revenge kill Garchomp, the next best option was often to punish its Outrage with a steel type. I think it's fair to say that Garchomp gave us more reason to use steel types on our teams, but also that Lati@s can be stopped through plenty of alternate means such as Tyranitar anyway.
It becomes apparent very quickly that this is just pointless theorymon once you realize that there are a number of Pursuit users that just beat the shit out of Latios, and many of them hardly even care what set it's using in the first place. Calling Specs Latios generally more powerful than SpecsMence is one thing, but calling it "far better" when it has such glaring flaws even in Ubers, and then using that to suggest that Latios will be "banned without a doubt" is just ridiculous.
Infernape can always toss out a U-turn at Lati@s face and do a good amount of damage to you, and then swapping away to something else. That's definitley NOT nothing and it can put the opponent at an advantageous position. I'm not sure how common U-turn is on Infernape, but it's definitely something to look out for, especially when you think you have the upper hand and then lose >50% from Orbed U-turn...346 Speed: Infernape
Not OU but pops out sometimes, moreso than Rapidash339 Speed: Mismagius
And this is really where I'm worried. No doubt that the twins will impact the metagame quite a bit. I'd take my chance at outrunning them with my own because they could be very destructive, and I want my first opportunity to get rid of them. Not as easy as it seems, though, but their prevalence (if so) will cause many uses, and when there's a lot of uses there will be a number of face to face meeting. Although the Modest one will most likely retreat because it doesn't want to take chances, this puts the Timid one at an advantageous position by denting whatever they send in hard. But whatever, I guess.319 Speed: You... you sit here, above base 95s
Garchomp wasn't just banned JUST because of Yache berry was it?
 
	The thing is, how can you ban a Pokemon from holding that item in battle?
Lati@s I think that they would have to stay in UBER. Movepool very big, stats incredible and if they wear Soul Dew became invincible. The Choice Sets are very good and the DDancers Sets I think as RaikouLover that maybe the most appropiate is 330 Spd.
grettings
Timid is definately a usable nature on Specs Latios, but I think Modest may be better in some cases.
Modest nature ensures that you 2HKO even Careful Tyranitar with Surf, and 2HKO steels such as Metagross and Scizor. Without Modest, you are losing those guarentees which could bite you in the ass in the long run.
Veedrock already explained why it isn't essential to run Timid on the set. Cool, you can outrun Infernape... but what does Infernape do to Lati@ anyway?
Unboosted HP Ice is laughable at best, and I don't htink Infernape is going to bother revenge killing you. As I mentioned before, speed ties with Gengar are irrelevant also, since the majority are Scarfed anyway. So then your stuck with the question... what lies between a Modest nature and Gengar?
346 Speed: Infernape
339 Speed: Adamant Dugtrio (doesn't care b/c of Sucker Punch), Mismagius, Rapidash... ok so 2 of those aren't even OU.
334 Speed: Garchomp (yay hes uber!)
328 Speed: Zapdos, Jirachi, Celebi, Salamence, Flygon... but this is assuming they run positive and max speed. Zapdos won't do very much to you. Jirachi with max speed is offensive and can't touch you. Celebi is a joke and never maxes speed. Salamence and Flygon are tough to tell. Flygon is commonly scarf, which you can discover early in the match when he's U-turning to hell and back. Which leaves Salamence. I dont think Salamence will ever risk that confrontation.
319 Speed: You... you sit here, above base 95s
So its up to you. I recommended 330 Speed for the Dragon Dancer and Timid for the sweeper sets, but Choice REALLY doesn't need it all that much. I actually run Timid when I run Specsmence, but Latias is sitting at a comfortable speed w/o boosting.