Well, at least the OP has made a good argument, as far as starting the topic with at least SOME reasons. Gawd.
Anyways, before I start my homework, I just want to make a couple of points.
Alright first off, remember that we
unbanned Deoxys-S, which was an Uber. I know that, to some of you, that means nothing at all, but to me it means something. Many people don't realize that he does overcentralize the metagame. It's not like said move Shadow Sneak and Sucker Punch are commonly seen, and if it hits Super Effective on you (which it will most of the said time), you're either going to be OHKO'd or 2HKO'd. The exceptions come to a really, REALLY Special Defensive Cresselia and Steel / Psychic types, but remember that the Steel / Psychic types still lose to Fire Punch. I think the only "safe" counter would be Spiritomb. And of course, let's not forget that Deoxys-S outspeeds positive natured 130s
without any EV investment and a neutral nature. If that's not scary, then I don't know what is.
And so, since that started, then we decide that one Pokemon is
now, not even 2 months later, that a Pokemon is overcentralizing the metagame that has been in that said metagame for
almost a year? I almost want to say that there might be some screws loose somewhere. Granted, Sand Veil is an ability that is somewhat broken, but remember that hax just "exists" in Pokemon. Think of it like this: in Gallade's counters, it states this:
Gallade Counters said:
Outpredicting the Choice Band set is the only way to really counter him, since he can hurt pretty much everything. Spiritomb is the best counter, as he is immune to both STAB attacks, and possesses high Defense to take hits from the other attacks. Gyarados is a good option, although a critical hit from Psycho Cut followed by another hit will 2HKO. There's always the chance that Gallade may be carrying ThunderPunch, so be wary of that too. Weezing will also be effective if Gallade doesn't have Psycho Cut. A Sleep Talk Heracross is the best switch-in you can get for the Double Status set (if Psycho Cut is absent). Cresselia will easily wall Gallade if he lacks Night Slash—she often carries Sleep Talk, so Hypnosis isn't really an issue.
See? Hax is just something you have to accept, sadly. Togekiss is even worse than Garchomp as far as hax goes IMO because Togekiss can actually stop many, MANY Pokemon with little to no effort, and is also bulky, as Dragontamer has pointed out. And since Aura Sphere and Air Slash is only resisted by Zapdos, Togekiss can freely carry Roost and Nasty Plot and still barely worry, because if Zapdos is paralyzed, Togekiss has a chance of beating Zapdos with just Air Slash (though make a note, that I would never EVER try this stunt at all). Garchomp is bulky, yes, but it's not like it's impossible to stop. Remember, there are many Choice Scarf Pokemon nowadays, and I'd like to state that I've carried Scarf Gengar and have successfully stopped Garchomps well. Once they're locked onto Outrage, they're climbing to their own demise. Gliscor is also a good option that I had on my team, though Outrage does take a slight bigger chunk than Skarmory takes (compare around a 10 - 15% difference). ChainChomp was always scary, but that just makes Cresselia's job easier.
What actually scares me the most of ANY Garchomps is Swords Dance + Outrage in the late game with a Yache Berry attatched. Many people don't realize that, since many think "oh it's a Scarf user, almost for sure" or that he carries Swords Dance plus Dragon Claw. This is where Cresselia is "fucked", being borderline dead and Ice Beam won't OHKO even if she chooses Modest since that Yache Berry will prevent that.
And may though you don't accept it, but many Pokemon have very few to almost no counters at all. Think of it like this: Gengar's only "safe" counter is Spiritomb. Lucario with Hidden Power Ice only really loses against Weezing, Spiritomb, and Cresselia (with Crunch, he loses to Weezing and Gliscor, but Spiritomb can still take a Swords Dance + Life Orb Crunch and still burn Lucario), and then the fact that Aura Sphere hurts many Pokemon on the Specs set, even pushing over 40% on Gliscor. Tyranitar is a Pokemon that was discussed as "BL-Uber" before, since Tyranitar is still bulky and even more bulky thanks to that Sandstorm. A x4 weakness to Fighting hurts, but that doesn't stop him from being used. Of course, Dragontamer discussed that many of Tyranitar's counters can still lose if they aren't carefully putting EVs in certain places or repeatingly switching back and forth without recovering (in the case of Swampert). MixTar can really put dents on any switch-in, possibly 2HKOing or OHKOing many Pokemon with little worries (but in a sense, he fears Hippowdon a bit more since he has to use a -Defense nature).
Remember when Rhyperior was a god? If you didn't use him as a physical wall, good job. A move coming from him always puts a switch-in in danger, even Bronzong who hates Megahorn. Many think he's too slow, but when I used Thunder Wave on Blissey and Body Slam on a Dusknoir, it was enough to do the job.
One thing to facter as well: Gyarados forced Thunderbolt and Hidden Power Electric a lot, how is that not overcentralizing? All I'm saying is is that if we're factoring that we're forced to run one move on a certain Pokemon, than this should be factored too.
I'm not for or against Garchomp being Uber. As much as I like Garchomp, I hate facing him as well since that Speed really puts a hurt on many Pokemon. When I have to use Blissey as a last-resort effort to take down a Swords Dance-less Garchomp, that's a bit scary (and I'm talking about as a very last resort). I just want to throw some things in here for people to think about.