hai guise I just got my Sega CD in the mail today, and was wonderin', is there any type of Game Genie or something to bypass the Sega Mega CD's region lockout? I've researched a bit, but to no avail. Halp?
There is the Megacart, you would have found if you clicked went to the accessories page of the Mega CD page on the wikipedia.
Either a cartridge based bypass like the MegaCart or Datel CDX, or an internal mod like multibios. You could always rip your Sega CD game to PC and use some modification tool to switch its region code to whatever you need as well.