I love it! I can register everything. My bike, Super Rod, Pal Pad, even my Pokedex. It is so convenient for me. And I agree with Nica, it is better than the touch screen controls.
Open the PokeDex and there should be a little check box somewhere on the screen which you can touch to select - it's the same one that appears on pockets in the bag, certain key items and Pokemon stats. Once you check the box, it'll appear on the menu whenever you press Y.How can you register your pokedex on it?