>>46814834Pretty easy, actually.
Main Menu, Tap the green button on the bottom, and go to Pokedex. then, at the seach bar at the top, use the second from the top "status in the pokedex" and just tap "not registered". That shows all of the ones not registered in HOME´s pokedex.
go a step further, and use the bottom "forms" button, that show which forms you still lack, like alcremie, vivillon and stuff like that.