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What keeps me going in this one is the fact that breeding for 5IV/6IV mons, and EVing them, is so much easier. I, personally, don't like hacking Pokemon (if you do, more power to ya, I just don't do it myself), so the better accessibility to "perfect" Pokemon is keeping me breeding, training, and taking them onto WiFi and into the Battle Maison.
Plus, I still have a long way to go on my Pokedex. I also haven't done any shiny hunting, which I plan to do after I get bored of the previous activities.