If you wanna know Every Battle theme (I don't know exactly what battle themes this game has because I haven't played it yet)
Battle Theme: Dreadful Encounter With the Dark Beasts
Battle Theme 2: Who's This Rascal
Battle Theme 4: Never Give Up (Never Give Up is used as a normal battle theme, but it's normally a boss theme)
Battle Theme 5: No Mercy!
Event Battle Theme: Desperate Situation
Event Battle Theme 2: For Those Whom We Must Protect
Boss Theme: Dreadful Encounter
Boss Theme 2: For Those Who Interfere
Final Boss Theme: Of Every Future