Despite the fact that the entire thread is premised on the idea that you don't look at each Pokemon in isolation, and that you have to justify banning and not unbanning, people keep posting as though this were a "which of these single Pokemon should be unbanned?". If you don't get the thread, don't post in it.
You don't just look at Kyogre and say "OK it can kill Blissey in 2 hits under the right conditions and weakens Fire moves" and then look at Ho-oh and say "Well, it has a powerful Fire move" and then look at all this new offense and complain about not having any walls, and in the same breath claim that Deoxys-D and Lugia wall too much stuff.
The point is yes, I had some reservations about Palkia and Kyogre. But they weren't certainties, and so I put them up for possible testing. Saying something ought to be tested is not the equivalent of saying it's not uber, but rather, that there's a chance it isn't.
To those of you who say "Kyogre is uber because you need a Water resist to take it on!", consider Garchomp. It's the second most used Pokemon in OU, and to take it on, you need a Ground AND a Dragon resist, and if it catches your Skarmory or Bronzong with a Fire move you could be in big trouble. I think having Lapras and Dugtrio for Kyogre isn't nearly as big of a deal as having Body Slam Jirachi, HP Ice Celebi, and Ice Fang Gyarados for Garchomp (and still getting screwed by a CH / Sand Veil miss).
I was originally in the camp that Deoxys-D is pretty solidly uber, but someone said something that realy made me think. Several of the Pokemon people use to take on Cresselia would still take on Deoxys-D. There would be fewer old OU Pokemon, but with all these new Pokemon, it isn't as good.
"Ho-oh is too good because of Sacred Fire!". Again, consider Garchomp. Sacred Fire has 8 PP, 95% accuracy, 100 power, and 50% burn. If Kyogre is allowed, this is suddenly the equivalent of 50 power. If we just remove Kyogre, there's still potentially Manaphy, Palkia, Lugia (4 PP Sacred Fire with Pressure? yes please), Milotic (who just LOVES that Burn), Heatran for Choice versions, and the ever present Stealth Rock dropping it down by 50% each turn. Garchomp's moves have high enough PP to mostly be irrelevant, double useful STAB, and the only Pokemon that resist Dragon are hit SE by its STAB EQ, other than Bronzong and Skarmory. Skarmory is 2HKOed by Fire Blast, Bronzong is 3HKOed and has trouble doing anything back. Of course, if we did allow Kyogre, the Rain would finally put a check on Garchomp, as it would allow Steel and Grass types to take on Garchomp a bit better. This means less of your team is devoted to countering threats like that, so you have more room to take on Kyogre-like threats. Fortunately for you, most of the Pokemon boosted by Kyogre have offense identical to or worse than Kyogre's, so countering it and its allies is a fairly redundant method.
I firmly believe that if Garchomp could only be caught once, it would be seen as uber. "What!? STAB on a 100 power move and a 120 power move, and there are only two Pokemon that resist the 120 power move that aren't weak to the 100 power move? Over 100 base Speed? Swords Dance? It learns a 120 power move to hit those 2 resisting Pokemon SE!? High stats all around? Of course it's uber!"
Try judging all the Pokemon by the same standards.
As to whoever said this is a joke, no, it isn't. I've been advocating this since before DP was released. Instead, people foolishly created tier lists for the Pokemon before several of us (and them) had even played (this was before English DP was released) based on their perception of how things ought to be based on how ADV was. I said back then that what will end up happening is that people will resist change and be too locked in their ways of what is and isn't uber to consider that maybe some of their old perceptions are wrong, but I was ignored. People then said "First you wait until the metagame settles, then you work on adding new Pokemon!". I explained then in the same ways that I explained now why that is a nonsensical approach, but the tier lists went through anyway. Now some of those same people are saying "No, if you want to make changes like that, you should have done it earlier. Now the metagame has settled, so there is no point in trying to mix things up!".
As to the complaints that doing this would remove OU as it is now, well, yes, that's possible (in fact, nearly certain). How I see it actually panning out is that OU shifts to include more possible Pokemon. Some of the lower OUs now get bumped down to UU. UU then includes more Pokemon. Then, when people start playing UU, we find the discrepancies among UU teams in terms of usage, and we bump some of the Pokemon down to NU. This means that, instead of NU being the garbage heap of Luvdisc, Whiscash, Wailord, and other uninspiring Pokemon, we might actually have some interesting Pokemon there so NU is actually worth playing (I played it in ADV, and it was pretty dumb, because most of the Pokemon there were just knock offs of higher tiered Pokemon, because all the Pokemon with anything good to do were at least UU).
I feel the need to specifically mention the Darkrai arguments, too. You don't need two counters to it any more than you need two counters to Crobat or Breloom or Gengar. Having a Pokemon to absorb sleep is already a good thing, and adding another Pokemon that can use a sleep move isn't going to change this one bit. Almost every game I've fought the past couple of days has begun with them using Sleep Powder or Hypnosis as I switch to one of my two main sleep absorbers, depending on who I feel will be less useful with that particular Pokemon out (or I just leave out my Jirachi, because you only get 1-4 "fast asleep" messages, anyway, so I have the potential to wake up as they switch to whatever). You let one Pokemon take the sleep, then you go to whatever you have to stop Darkrai. It is bulkier than Gengar in terms of stats, but I think Gengar more than makes up for this in terms of resistances and immunities. Darkrai gets Calm Mind to set it apart, but it's not like Darkrai is some obviously uber out of control beast and Gengar is tame.
I didn't mention Arceus for two reasons: 1) It's an illegal Pokemon (duh), and 2) Because of 1, I have no experience fighting it, so I'm not going to comment on it.
If you think the Pokemon I suggested adding are too offensive, then perhaps Giratina should be allowed. If we let in Latias and / or Latios without Soul Dew (I actually find Latias to be better than Latios, but whatever), then I'd definitely move Giratina to the "test this one too" list.
Whoever said Wobbuffet is seen as cheap / overpowered / immoral / whatever even in ubers, you are dead wrong. Wobbuffet is incredibly weak in ubers because it can't switch in on any real attacker. The "it has no counters" argument also applies to Dugtrio and Magnezone.