For all the people saying "XXXXX" should be OU, who cares? The only tier that matters is uber, because it's the power cutoff from over centralizing the game. The rest is just balancing issues that fix themselves out over time. If you are saying "Lucario is OU because it's a beast" and the only reason you are saying it is because you want him in OU, and not because you believe it's for the good of the UU metagame, shut up. If you want him to rise just to be in OU, make it so. Does it matter if he isn't OU? No it doesn't. just because he isn't OU doesn't mean you can't use him in OU. People need to stop saying "XXXX should be in OU because it's awesome", they should be saying "Because of XXXX presence in UU, the game has become over centralized on defeating him, and each team has to carry many options to take care of him and he makes some people in the tier completely unusable, etc". Besides, the tiers aren't even really established right now. We can throw names on a list but right now the only established tiers are Uber and all other pokemon. OU, BL, UU, and NU will develop as the game does, people need to calm down and see that. *Rant*
Besides, who says Gen 5 has to follow the format of all previous generations? We aren't limited to just Uber, OU, BL, UU, and NU we can branch off. I am toward a totally reworking of the way we look at tiers, because of the whole flip-flopping of the game. For example with numbered tiers. This is what I mean:
Tier 0: Basically Ubers
Tier 1: The Better half of OU
Tier 2: The Second half of OU
Tier 3: Essentially BL
Tier 4: Better Half of UU
Tier 5: Second Half of UU
Tier 6: This would be NU
While people may think this is unnecessary look at the game, an exampling being UU. Terrakion and friends would wreck normal UU and because of the massive amounts of pokemon in the game, there would be no use of them, so divide the tier. Same thing with OU, look at Blaziken, people are putting him as uber, but I think he wouldn't thrive in Uber at all. The only problem with this system is finding battles, since it would divide the community into 7 different team styles. Maybe not as many as I am suggesting but a working of the system I think is necessary.