I was trying to think earlier of where it was we got our tier list from. But there have been so many changes to it that I just can no longer follow it, and wonder about why we are using said tiers. So, can anyone explain this fully?
UU/NU are from StadiumUU iirc or something like that The OU list is Smogon's, I'm fairly sure about that EDIT: http://z10.invisionfree.com/UU_Stadium_Forum/index.php? Too bad all the topics got purged Source: http://pokemon-online.eu/forums/showthread.php?5263-Adv-Tier-List&p=54333&viewfull=1#post54333