Haven't had chance to post in the thread, but I just want to chime in and say that regardless of how many times it'd been said already it bears repeating; amazing job on the guide, it's incredibly helpful.
That being said I haven't seen anyone else point this out;
If you want to get style quickly, you can buy a single premier ball at the Pokeball boutique over and over again, exiting all menus so that your character can move again every time.
You don't actually need to exit the menu, just repeatedly press A and buy one at a time. It tracks individual purchases based on the number of times you purchase. Which might not seem like a world of difference, but I imagine exiting and re-entering the menu every single ball, all 99 times, probably adds up.
On another note, adding a small note in the guide about the Hatching O-Power might be useful, I know it doesn't pertain to IV breeding specifically so much as breeding in general, but the way of getting it is obtuse enough that I could see the information being helpful enough to people to justify including it.