SudokuMasta

Is there anyway to unlock all of the other music options for battles through PKHeX in USUM? I figured it was probably something to do with event flags, but there aren't any event flag options for things like defeating the Rainbow Rocket bosses, which I know unlocks their battle themes. I really just don't want to go through the effort of unlocking these by playing in game stuff when all I use this game for is competitive battling.