I'm about to finish the game and I know the postgame will make me do a lot of promotion matches for Floette and get Xerneas and Yveltal for Zygarde, but can I choose the order? Zygarde is my favourite pokemon and I want to catch it on my birthday (in a couple days) but I don't know if I can go straight to it after the first postgame promotion match or I have to get Floette first, then the get the legendaries.