Iris' theme is so... odd. It sounds like something out of Megaman Battle Network (or Star Force, since it sounds astronomical at points). I kind of like it, though.
I enjoy the frantic feel of Hyu's battle theme. It also sounds a little Megaman-y... but then, a lot of these are sounding like that. I suppose that's because the idea is that the music is more futuristic, since it's furthest in the timeline.
Vs. Kanto Leaders is nice and nostalgic.
Vs. Johto Leaders is even more nostalgic. I love the bells. It sounds almost hushed... yet intense.
Vs. Hoenn Leaders... not sure if I'm too much of a fan. It at least has the instrumentation to remind you of Hoenn, but...
Vs. Sinnoh Leaders is AWESOME. I love the staccato going on! It makes it so much more frantic and intense... Then again, this theme was one of the better vs. Gym Leader themes in the series.
Vs. Unova Leaders (BW2) is a wonderful remix of the original. BW's version was possibly my favorite Gym Leader theme in the entire series, and this one maintains that awesomeness. I adore the opening. (DAH DAH DAH DAAAH DAH DUN, DAH DAH DAH DAAAH DAH DUN..)
Vs. Reformed N is nice to listen to. It's intense, a nice remix of the original theme.
Vs. White Kyurem/Black Kyurem is nice and creepy. Makes you tense, which is good.
Vs. Achroma is fitting with its psychedelic feel. It's definitely the weirdest theme I've heard so far.
Vs. Ghetsis is SO MUCH BETTER HERE. OH GOD. The first one was slow and clumsy, but this one's chanting is actually haunting. This is a scary theme. I love it.
Vs. Neo Team Plasma is just as intense as its original version. I like it.
World Tournament Final is freaking great. It's so frenzied and encompasses the idea that he final battle is the culmination of a long journey. So great.
Vs. Blue is pretty great. His wasn't my favorite in the first place, so this one isn't anything special to me.
Vs. Lance is so grand and awesome. Vs. Lance is one of my favorite Champion themes, and this version remixes it very well!
Vs. Wallace/Steven is really great! Intense and high-energy, like a Champion theme does best.
Vs. Cynthia... I'm lol-ing at how they just continue to raise the key of her theme with each remix. However, I have to say, I like this version more than her BW version, which was just plain boring.
Vs. Iris. As I said above, very Megaman-y. It fits her, I suppose. I'll have to give it a few more listens.
I wonder if Alder's theme got remixed? The video I was listening to didn't have a remixed version (and it was plainly noticeable... the style has changed between BW and BW2, it's apparent). He should get a remix.