Have fun completing the entire national pokedex. You're better off trying to get it in Black and White where there are less pokemon, then using masuda method or similar there.
Completing the National Dex in XYORAS is easier because the experience share is broken as hell. Plus you can use the blissey secret base method to level at rediculous speeds.
Took me a bit over a month but you have to include I pretty much 100% Y in the process
Yeah, the thought alone of completing the Pokedex is sickening, but I really want that thing. I saw a guy giving away 10 of them, but he had like 30 comments in a few minutes. lol