This code gives you the effects of having everything unlocked even though you haven't fulfilled the requirements to unlock all. You can still unlock karts/bikes.
NTSC-U:
04544438 38600001
PAL:
04549974 38600001
NTSC-J
045492F4 38600001
NTSC-K:
045379CC 38600001
I ported this code to NTSC-U, NTSC-J, and NTSC-K
NTSC-U:
04544438 38600001
PAL:
04549974 38600001
NTSC-J
045492F4 38600001
NTSC-K:
045379CC 38600001
I ported this code to NTSC-U, NTSC-J, and NTSC-K
~MarioKartWii.com #1~