Relic Castle

I know it’s possible to have different screens, like the bag, for the players, but I was wondering if it’s possible to have this for other screens such as the town map and Pokédex.

I know that the different screens would have to be made and I know how to do that. I am wondering how one would go about implementing them into the game.

I know the bag is easy as I would just save over the current files, but I am not sure if I would do the same for other screens.