Okay, I already had the edited save working with no errors. I deleted it because I wanted another save file that didn't have any completion (new game) in Super Smash Ultimate xci. I am using SX OS 2.5.2 emuNAND 6.2.0 with exFat support. I am working on a mac. When I finally had both the new save...
@Xdqwerty, Osu! Tatakae! Ouendan! is the Japanese version of the game, different settings/characters/songs but otherwise identical mechanics. I played that before I knew about Elite Beat Agents lol. Both fantastic games https://en.wikipedia.org/wiki/Osu!_Tatakae!_Ouendan