In the gen 4 meta, there was 48 OU mons. Now there's 52, despite adding 13 new OU mons. So 9 mons that were OU in gen 4 no longer qualify, being completely outclassed by gen 5 mons. That's the power creep, the tiny percent of seriously powerful mons keeps encompassing more and more individuals. We've got a mon with base-700 stats in OU, and it's honestly not that good. What other generation would that even be possible?Gen I has 12 OU Pokémon, II has 9, III has 7, IV has 11, and V has 13. In summation, fuck your power creep. We get viable Pokémon every generation, old or new. Having two Uber tiers or making UU the premiere tier are stupid. The metagame will shift, as metagames do. Changing tiers in this way is not a good solution to holding on to your precious Persian.
This doesn't even mention stuff like Choice Band and LO. What items has defense gotten that are even close to that level?