This guide suggests buying a "Great Ball Upgrade" that no longer exists. Also, there is a section about failing to level up pokemon at level 99 since that is the cap it becomes impossible. That cap has been increased to 100 now and the section should be updated. There is a section that talks about not switching since that was a problem, but it seems that most of those problems have been resolved and that section is no longer needed. I think the section about rebattling gym leaders is also currently false, and can be edited/ removed.