Originally Posted by Kamekazi
Wait, I'm jsut guessing but do we just choose four moves from the Ultra-Dex thing?(I still feel stupid...)
You can choose your moves from the options that your pokemon has.
The Ultradex gives you a good list, but you can't use TMs, HMs, or any other moves but the ones it learns by level until you buy it some more.
I tend to use Serebii.