Wait just a minute, what's this about Garchomp going Uber? Sure, it has good stats, but it isn't unbeatable. Right off the top of my head, both Weavile & Starmie can outspeed it in general (not counting Scarf boosts) AND get a 4x SE hit on it, and even with STAB in the case of Weavile. Even if it does use a berry to decrease the damage, that's still its only item, which means no Choice item to ruin the previously-mentioned Pokemon's speed advantage.
He's pretty powerful without Choice alone.
That just leaves Sand Veil. ...Now, seriously, if we're going to make Garchomp Uber because of possible (but unlikely) Sand Veil abuse, then that's kind of sad, isn't it? The evasion increase is still inferior to just ONE Double Team. Besides, Froslass gets a similar boost in Hail and Garchomp's pre-evolutions also have Sand Veil, so why not ban those Pokemon while we're at it? :O Yes, I've played with Garchomp, and I've even tried using it in a Sandstorm, but I hardly noticed any difference. Yes, that is personal experience and not exactly admissable as evidence, but I honestly doubt that one situational level of evasion will make that much of a difference.
We ban Latias because of a possible Soul Dew use. Glalade, Gliscor & friends aren't nearly as dangerous in a Sandstorm at all compared to Garchomp. And yeah, from one person who has been swept because he missed, AND got hit by a crit on more than one battle, that hax can be painful.
...You know what, what if we did something similar to what Lati@s was in ADV: if the player also has a Sand Stream/Sandstorm user, Garchomp is Uber (even though I still disagree with that from experience alone). If not, then it's just OU.
Of course......this is just one person's thoughts on the matter, so respond to them however you wish, if you even do.