After the ending scene, when you wake up and go outside, your partner will greet you. If you want to go to the Pokemon Square first, go ahead, but when you go to leave for a dungeon/rescue/delivery, your partner should stop you. After he/she stops you, he/she will tell you that you can change leaders, and I believe he/she will tell you how to switch leaders I think it's after you beat Rayquaza that you get to do someting like what the guy above me said.. .
I think, so don't blame me if I'm wrong :P.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.