I got my behind stomped at Zeromus and almost every random battle where I didn't run away in that final f***in dungeon. It wasn't until my nephew got IV for his GBA that I decided to try it again, since I could actually take the time to level up because I could take it with me that I finally beat him. But even then it took me forever cause I would level up, save, fight him, lose, level up some more, fight him, lose, level up some more......you get the idea. I did that maybe......10 or 12 times before I finally beat him.