I have a way of doing it open two of the game then leave the other one where you can see your game with your pokémon on it with new game option and other stuff same thing in the other game then what you wanna do is just in the one of them press new game then save it when your about to pick your starter then exit to that game play the other one then save it in that game soo you won't loss it you can do it all over again it also save your badge soo if you wanna restart your game without losing your op team do that WARNING IT DOES NOT SAVE PC POKEMONS AND ALSO NOT ITEMS IF YOU WANNA SAVE THEM GIVE THEM TO YOUR POKÉMON