Ok, I'm going to break this down too, but there are some points this can emphasise.
The problem with Garchomp is,that it is EXACTLY liek Deoxys.
No. No. Garchomp is bulkier and doesn't
need Life Orb and coverage to sweep. Deoxys is also shut down by Thunder Wave. Keep in mind that Deoxys even has counters - Bronzong, Metgross, Jirachi, Forretress (it works ☺). Nor does deoxys have that kind of typing - It has 3 weaknesses and no immunities to switch in on. Think about it more.
It does wup ass in OU,because even i can wup ass with it,but it wil get bullied iwth ubers.
Ok, what
you can do with it is not worth considering in the slightest. Jumpluff is awesome if played by someone with good prediction, but it's still UU.
As for it "Getting Bullied" in Ubers, lol. It has 102 Spd. Enough to outspeed most Uber threats. There are other reasons, but whether or not it can cope in Ubers is not a concern. (ERG - Equal Rights for Garchomps....) Uber is an OU ban, as BL is a UU ban. Many BLs suck in OU, but they are too good for UU, thus, they are banned.
I never was Garchomp for OU.I only use it because it's strong.If it was put into ubers poepel would have to figure out new tactics with it,whihc means it woudl liven up uber instead of biring out OU.So,it ouwld also do two good ithngs.Overall,i inthk it shodu definitely be in ubers
Ok, I think that acually has some merit. It would give more pokemon play in OU, but that is not the main concern. Blissey was SO overused, yet there was no attempt to ever ban it. (Except for the "NO SKARMBLISS" user comments in the old Netbattle.)
My Vote - Uber.