Why haven't you already done this?
Seriously though, for my friend which I can agree quite much on, is that there will be no character customization at all, something that made X and Y very good. You actually do get a little depressed from it, but I still think it's worth it, 90%. They've also made swimming around quite enjoyable if you have a Sharpedo. If you haven't seen it yet, trust me, catch one when you can and learn it surf.