I forgot to mention, I find the fact that a remix of the Hoenn trainer battle music is in B2W2 very odd. I would expect the Hoenn remixed gym leader theme to be in, because of the World Tournament.. but why is the trainer music in? Hm.
If you haven't heard it: http://www.youtube.com/watch?v=AAdNIs3XUKU
It's ripped from the ROM and legit, as the person who did it also ripped Homika's BGM from the ROM.