Ok I had to get in on this one.
There is no such thing as replacement mapping. Its called DISplacement mapping. Please dont post things you just hear and get it wrong.
OK, nomatter what anyone says the wii CAN NOT do normal mapping. normal mapping is a pixel shader and the wii cannot do it!!
I know the latest Dewy game or whatever claims that have it but it is indeed at BdVr bump. We are doing the same thing and it works like a directional bump.
No console really uses displacement as its expensive and bumps are a bit better.
The wii uses a distant cousin of OpenGL so it can do some things but dont expect much.