Pokemon ranger shadows of Almia: editing partner

[Alegria]

Hi! I basically finished the game and I was thinking it would be fun to change my partner into somemon that is not meant to be a partner, or alternately, to have the Darkrai from the DLC mission, which is pretty much like a second partner and isn't counted in the slots of caught pokémon.

So naturally I found that there were action replay codes for this, but I'm using a nds forwarder on my 3ds so it wouldn't have worked. A second solution was to have said AR codes in a file and play the game with the Twilight menu... but the "all cheatcodes" file I found can't be opened in the "AR code editor" program I found and I don't know how to format the file. Either way I don't know how to unlock through cheat the dlc's partner Darkrai.

I was hoping there'd be a save editor of some kind, which would allow me to use the nds forwarder... but the only one I found was editing the save file to add the dlc missions, which I had to use of course.

 

I didn't even get to find even a video showing the AR codes, and I am very curious to see what are those "Darkrai without legs" and "Darkrai with legs", for instance.

 

so yeah, ideally I'm looking for a way to edit my save file, if it's possible to cheat like that, or else any advice is welcome.