Aldaron, while I respect your opinion, I disagreed with your proposal and I disagree with you now.
You are indeed correct that each of 1,2 & 3 are not broken. Many other Pokemon can fall into each category, being versatile/offensively strong, good at Hazards or good at Screens. The key word, though is or. No other pokemon can manage to do all three as effectively as Deo S, to the point where no one can actually guarantee to stop it from setting up at least 1 layer, be it spikes or screens. Yes, it can't do it all in one set, that I accept and agree with, but the problem lies in the effectiveness of all three, making it a completely random guess.
On the topic of Spiking, it is generally agreed that Skarmory is still a very, very effective Spiker. That thing is able to get Spikes up, and very efficiently at that. However, can a Skarmory pack as much offensive punch as Deo S can? Can a Skarmory set up Screens as effectively as Deo S can? Simple answer, no. It can't. I know when I see a Skarmory, to keep my levitate users and flying types alive, because they'll be far more likely to survive given they don't get hit by spikes. That is a strategy against Skarmory that, in all likelihood, is the most effective one. 9 times out of 10, a Skarmory will be a Spiker, as there are far better Pokemon for Offense and Screen roles. That means that even thou I'm taking a guess that it's a Spiker, it's a guess that I know will more often than not pay off. With Deo S, though, it's Spiker set is effective, so is its Screens set, and I've even personally had success with a Deo S lead running nothing but attacking moves. For Skarmory, my guess is one that has a high chance of being correct. For Deo S, I guess, and I have a 33% chance of getting it right. I also have the advantage that Skarmory is often used outside of the lead spot as well (leads do exist, but they're about just as common in my experience), so I can make an effort to force switches to Skarmory, which can easily be hit with a nice Fire attack on the way in, denting it to make it easier to get through. Deo S's Spiker and Screens leads are rarely used outside the lead position, and hence you can't dent it before it has already fired off a move. It's the same as saying Stealth Rock beats Ninjask. Sure, if Ninjask switches in, but who uses a Ninjask outside of the lead position? (let's not fill this thread with "who uses Ninjask?" comments... Please?)
Regarding Screens, yeah, i remember having a hard time stopping Bronzong setting up screens as well. Thing is, though, that Bronzong is guaranteed a layer. Not only is it as often as not used outside the lead position, making it easy to land a hit on the switch in, it's also very very obvious. I see a Bronzong and a few sweepers, I know it's likely Dual Screens. If I see a Marowak with Bronzong, I know it's Trick Room, and thus don't have to worry (as much) about Screens. Yes, I can do the same with Deo S, but the problem is if I see a team full of Sweepers, that doesn't tell me anything about Deo S at all. I've personally used to great effect a team of six sweepers, leading with a total Offense Deoxys sweeper with Life Orb. That, I know for sure, works. Everyone thinks Deoxys will go for Spikes or Screens, then I proceed to kill their lead on the first turn with the appropriate coverage move. Also, sweepers can benefit from either screens or spikes/SR, so even if I see Haxorus, SpecsLatios and whatever other sweeper, I still don't know if I should lead with a spinner, a Brick Breaker (lol Brick Break) or my wall in case this Deo S is a sweeper itself. I see a Bronzong, the rest of the team gives it away as to what set, and I can be pretty certain my guess will pay off (let's face it, a Marowak under screens is useless without Trick Room, and a Sweeper under Trick Room is so slow it needs screens). With Deo S, it's a matter of all three options being equally likely, and I can only prevent one, while the other two blow up in my face.
I think I've now covered Screens, Spikes/SR and Versatility. Now comes the problem that for me is the last straw. As I've said, Deo S is a very effective Pokemon at all three jobs, and there is no way Team Preview, even with the ability to see your opponent's Pokemon, can tell you which set Deoxys is running. At best, you can change your 33% chance to a 50% chance, by eliminating the possibility of a Sweeper Deoxys S. That's all you can really do to improve our situation. Now comes the hard part. Let's say, I get lucky, and I know for a fact it's not the sweeper lead set. And, let's say I'm running both a Brick Breaker and a Spinner. Which do I send out? If I send out my Brick Breaker (again, lol Brick Break, but bear with me), and it lays spikes on Turn 1, what then? My first move would obviously have been a resisted Brick Break, and then next turn regardless if I switch or attack with a coverage move, it will get off the second layer of spikes. So, what if I lead with a Spinner? But what about if my 50% guess happens to be wrong, and it sets up screens? Regardless I attack on Turn 1 or Spin, either way it's getting up the second screen before I can kill it on turn 2, and that's even assuming I can manage a 2HKO. Yes, if I guess right, I'm fine. But at best, that's a 50% chance, and thats if I know that A) it isn't the offensive lead, and B) I pack both a spinner and a Brick Breaker.
I guess the point is that it's not what each set that Deoxys S can pull off that makes it broken, it's the fact that it's impossible to know which set its running before its too late. Screens can let a sweeper easily knock out half your team before you knock it out (CB Haxorus under screens is not nice to face), and a Spikes set can either allow it's teammates to sweep, while 2HKOs become OHKOs because you're racking up spikes damage, or can allow a balanced team to slowly rip you to shreds as they force switches. It's not any of 1,2 or 3, it's all of them in one pokemon that's broken.
