It says, "Each battle will last a maximum of 20 battles." I think that's wrong. It should say turns, not battles. It also says, "4-5 Pokémon must be registered in the battle box." Then it says, "4 of the 6 Pokémon will be used to battle." So you can register more than 5 Pokémon, unlike it says just before. (I would correct the page myself, but I don't seem to be able to for some reason)