What is it about Deoxys-S that led to this sudden nomination and majority vote for it? It is considerably weaker than the rest of the metagame with its base 95 offenses, relying on coverage and the severe weakening of most pokemon to be able to sweep. Its speed is nice, but it is outrun by a few Chlorophyll sweepers this gen and also loses to various Scarfers + Excadrill.
Dual Screens? It isn't the only pokemon capable of using them. Latios has Screens + Memento, Azelf has screens + boom, Jirachi has screens + Wish, etc. This isn't a unique niche for it and it shouldn't be treated as the be all-end all strategy that it was last gen.
Then there's its role as hazard layer, which has taken a harsh, harsh hit this generation with the lessened effectiveness of suicide leads, the presence of better hazard setters (Hippowdon, Skarmory, and Ferrothorn especially), new abilities in the form of Magic Bounce, and the buffed effects of Magic Coat. Deoxys-S will often gain 2 layers at best in my experience, which is no better, and often worse, than the multiple layers that Skarmory, Ferrothorn, Forretress, and others can accomplish. If it runs Taunt...it can be bounced back easily, while it is helpless against Xatu and Espeon. And unlike the pokemon I mentioned, it is much easier to kill, meaning that it has a smaller window to get those hazards down in the first place.
I'm really just not seeing where Deoxys-S is broken this metagame, in any way, shape or form. Hopefully someone can enlighten me.
This may just be me, but there are several things that lead to Deoxys-S being nominated to rejoin his brethren in the uber tier;
1. Deoxys-S lead invalidates 90% of all other lead pokemon. There isn't a single suicide lead fast enough to taunt Deoyxs, and Prankster Leads aren't that common and will have anything they do bounced back in their face since Magic Coat's priority is unbeatable by any lead pokemon. In this case, it gets nominations because it's a lead so good that it makes non-attacking or anti leads look like a pile of **** in comparison; forcing dozens of perfectly good set-up leads out of viability because we want an ex-uber to stay OU is not good.
2. Deoxys-S has nearly the same special attack stat as Starmie and its physical attack stat is just as high. Not only that, it has an incredible movepool and a speed stat that can let it revenge kill or 2HKO a wide variety of pokemon. Even traditionally fast pokemon like Gengar and Starmie are screwed if they're not running scarves. Deoxys has low HP, but it's not exactly made of glass, and it resists two priority moves and outspeeds the rest with its own. It has all the coverage it needs, and despite its "low" attacking stats, it has the most powerful psychic move in the game in a meta where Psychic is picking up a lot of targets. I personally don't like the idea that pokemon would need to rely on scarves when they have much, much better non-scarved sets or weather speed boosters being even MORE prominent just because we wanted to keep a pokemon that was designed to make everything else's speed stat look puny in OU.
3. Deoxys-S also does support better than anything else. Other things can dual screen, yeah, but other things can also be taunted. Deoxys-S? Not so much. Between its role as OU's super-lead, its abilities as a mixed attacker and revenge killer who cannot be outsped unless you rely a lot on weather or Choice Scarf, and the fact that it also has really good supporting sets, Deoxys-S has the same problem people were complaining about with Blaziken that it has a lot of strong sets that are not easily predicted, and can do major damage if you guess wrong what it's trying to do.
4. Deoyxs-S exacerbates the stat creep and shift towards bulky offense in the metagame. We're already starting to regard pokemon that aren't absurdly fast as unviable in OU play unless they're bulky, but now even ordinarily super-fast but not particularly defensive pokemon like Starmie and Weavile have Deoxys-S hanging over their heads; it doesn't need a crapload of offensive power to knock down the things that are fast but not as fast as he is. Instead it simply makes the already annoying trend towards teams trying to work in a specially bulky choice banded pursuiter to deal with Latios even more vital to kill it when it tries to get away.
5. It used to be an Uber. All of its other forms except D are Ubers, and D has even less offensive power, poor HP to offset its mondo defenses, and unlike S, is pretty much limited to support and stalling sets, which OU taunters CAN deal with. People are naturally going to feel like something designed to be superlative in the category its form indicates is more at home in Ubers than OU. If it's going to outperform an entire kind of lead that didn't get any weaker over the generational shift, why keep it OU?
Those are the reasons that come to me, but then again, I thought letting ANY of the old Ubers come back to OU was a mistake, and would probably vote Deoxys for ubers anyway for the above reasons and because
**** Deoxys. I hope that doesn't invalidate the arguments I actually spent some time on, though.