The Legend Of Heroes 2: Prophecy Of The Moonlight Witch
Defeating the final Boss
Have Juiro Brave Rush and kill all the little death things, then pick up his attack and use his super mover (Brave Dash) on the final Boss. It should be a one-hit kill. If not, hit the Boss again with normal attacks. You should win in about two or three minutes, depending on your level.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art / Original