https://www.youtube.com/watch?v=Jb-_MU2hKLEThis is the worst trainer battle theme in the series, it starts off perfectly solid, but the entire guitar/piano part from 39: to 1:00 drags on and sounds horrible, it's Smash remix was even worse. Most everything else from XY sounds fine, but when the most common battle theme shits the bed and the Gym leader theme is lackluster, it's hard to remember the whole soundtrack fondly.
Speaking of terrible Pokemon songs in Smash, this is by far the worst shit I've ever heard
https://www.youtube.com/watch?v=hfjNQwxw9tsFor comparison, here's a really good battle theme:
https://youtu.be/hnBkfUF7ROg 
