Nishijou

I don't know if I'm posting this in the right place but after i edited my pokemon using pokesav for heart gold and start up the game I try to go to my pokemon party list to try and set darkrai as my first pokemon to see if he follows me but the game just freezes when I hit the pokemon list =( I can see the pokemon fine and go to the list fine when I'm battling but I can't outside of battle >.< Thank you for your help!