Welcome to the Medallium section of the guide, which is pretty much a listing of all of the Yokai you can find in the game. On the menu screen, go to Info and you will be able to access the Medallium in-game. You have the option to view it in either a book format or a list (press Y for this). While in list form, you can sort the Yokai via a few different options, such as their official Number, Tribe, Rank or Name. Also, when you have encountered or befriended a Yokai, you can view more information about them by pressing the X button, including their moveset, as well as a general location (if they can be encountered in the wild).