There are 2 ways to make them.
Method 1-U will need A Sharkport, a PC with a USB port, and MK's program.
Method 2- U will need a GS2, and the proper codes.
I would say method 1 is the prefered way, it's definately easier. So if U have a PC with a USB port, get a sharkport. MK's is free.
Of course if U already hav a GS2, U may want to try it that way rather than spending the cash for the SP, but as anyone who's done it both ways will tell U, the SP is way easier for hybriding.