If you hold your shield and lightly press different directions on the control stick, you will notice that the shield will move slightly in whatever direction you are pressing the control stick.What is the difference between blocking regular and blocking whilst tilting upwards / downwards?
However, you have to be careful, otherwise you will roll, jump, or spotdodge.
This isn't available with the Wiimote. However, it is usable for the WiiChuck, that other weird controller for the Wii, and the GCN controller.