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Yeah... see title... I want to bring in a boss, and so far I've got a cutscene where my charater is shaken and flashed at, and the evil villain laughs, but I'm wondering how I can get a boss battle to work.
If you want it to have different music than a normal battle, use Change Battle BGM just before the Battle Processing command. Just remember to change it back to normal after the battle, or the battle music will stay that way.