Like Julia could have a High School Cheer theme mixed with electric guitars  
	Shade's could be one of those horror chases themes from indie horror games
 
	 
 
	Radomus could have big band jazz
 
	 
 
	And the circus trio could have a Circus themed battle song
 
	 
 
	Also, what I usually do is analyze the gym leader's specialty and field. And right before battle, I change the leader theme in the game's files to something more fitting.....am i the only one who does this?