It really seems to me that the PvP pet battle opponents I encounter are either pretty easy or a pretty even match before 8 pm (Central Time). As it gets later and later, the opponents get tougher and the more likely it is that I will play the same opponent that trounced me before. I almost always play it out, but I hardly ever win after 8 pm. The opponents are tougher, often with strange combinations of the new 5.4 pets, and they hardly ever, ever make a tactical mistake. The exception is Monday night, where I will eventually finish the outstanding battles for the quest. That's all I can stand, so I figure I have about 4 more months until I hit 250 wins for the achieve.
I've been playing almost exclusively with a KLR freeze team (Frosty, Kun-Lai Runt, Water Waveling). I know it's not that good any more, but it's surprising I can't eke out any wins later in the evening.
Anyone see a similar trend, or is it just me?