How can I save

Even if it fails to create the save file, it can still put it there.Then the next time you try to create the save file, it tries to use the old, failed save file, and fails again, even if the current settings are correct.

hmmm how bout u try it then, download ouendan 2 and see if it auto saves for u, cause at the moment im totally lost

I would, but I don't see any game listed as Ouendan 2.It goes:
Otoshi Deka Deka san Watashi ga Yarimashtia
Then:
Over the Hedge.

then ill just give u the link.... https://www.romulation.org/NDS/1081_-_Moero_Nekketsu_Rhythm_Damashii_Osu_Tatakae_Ouendan_2_(J)(iND).rar.html/ try it out nao

So wait... your problem isn't with the emulation... you just don't know how to actually save in game?

Oh, oops srry should have stated that. So yes thats the problem im having mainly

Well, I can't read Japanese, so I don't know what I'm doing.But some of my google results say that the good things about Elite Beat Agents over Ouendan is that addition of Auto-Save. So it looks that Auto Save may not be a feature in Ouendan.Edit:
Or not, who knows... I can't read anything in this game :)

hmmm, well I have the first 1 on No$ and it auto saves for me, not sure about ouendan 2 then