Just the battle music that plays for most battles in the wild. I think it has "butterfly" in the name. Any other music from this game works, too. Thank you.

I didn't have the time to search around to much.
But you can download the songs from bluelaguna.net

Also do you mean the main battle theme?
If so I believe it's called "The true mirror"
Anywho I hope that helps, take care:)