Hello,
I have used DSBUFF 0.5.
1. Unpack Simcity Creator (US)
2. Copy the arm7.bin to another directory and delete the unpack dir with Simcity Creator.
3. Unpack Sonic Chronicles and overwrite arm7.bin in the unpack dir with the arm7.bin from Simcity Creator.
4. Now press Pack in DSBUFF and...