OK. I got the SCSD SAV files to work on the DSOne:
OK. It works with the exception of a few games: Mario Kart DS, Super Mario 64 DS, Contact & Tamagotchi Connection Corner Shop. All of these have different SAV file sizes.
All of the SAV files were games patched & played on the SC SD. They were renamed to match the title on the DSOne but I left the .nds.sav & long file name on it. All of the ROMS on the DSOne are RAW ROM files dragged & dropped on the micro SD.
BUT, some of the heavy hitters DID work: New Super Mario Bros., Phoenix Wright, Big Brain Academy, Brain Age, Animal Crossing, Star Fox, Tony Hawk Sk8land & Trauma Center.
COOLNESS. Now all we need is the damn error screen on boot removed & Animal Crossin at normal speed! We're SO CLOSE!