Lately I got addicted to the Zeks&Reshi battle all over again.
I'm not sure if it "beats" DP's Dialga/Palkia Battle (oh God the Brawl version O_O), but there's something very pleasing about this tracks beat:
http://www.youtube.com/watch?v=_F87TfBklbY
That 1:23 part ^_^
The BW2 Kyurem remix is awesome too:
http://www.youtube.com/watch?v=YhqxUfkJC_0
The following link has 2 awesome Zekrom/Reshiram cinematic tracks that nobody seems to remember, they're worth checking out tbh:
http://www.youtube.com/watch?v=yOkdA9s6E94
Have you guys heard the battle tracks in BW2?
The Rival, Ghetsis, N, Plasma, Corless battles are all great.
Iris gets a..."unique" champion theme which sounds anticlimatic at first. but gets too catchy really quickly. I personally love it now.
And anyone notice how each gym has a different version of the Gym Theme?
They're unique and worth checking out, not just a slight change in the track.