Someone on YouTube posted game footage of their battle with Xerneas a few days ago. Nevermind how gorgeous the graphics looked, but the music was just so beyond extraordinary that I ended up looping it for hours on end, haha. I don't know if Yveltal's is the same, but watching that is really what gave me the final push to choose Pokemon X. I highly recommend checking it out, assuming the account hasn't been slapped with copyright claims yet - it had nothing but music leaks up.