It's connected to your Nintendo ID AND your 3DS. Keep in mind though Items cannot be put into Pokebank so you wouldn't be able to put Mega stones and whatnot into Pokebank storage. --- 3DS FC: 3754 7732 9971 Fighting Safari - Meditite, Sawk, Tyrogue
yes, thats the point of the bank. you will get them, probably from the moment you get your starter.
but you will lose all your items. I'd say, if you spend any time collecting items or in the maison, buying a used game for cheap would be better --- 3DS: 3351-5468-4271 IGN: Benny LF: EU 3DS Club Nintendo Star Code, FT: HIB 2 and 3 Steam Keys
You can trade them/give them away to people, or find a trusted user to hold onto them for you to trade back to you once you start a new game. I personally would go for the second option, so you have doubles so you can trade away for the Y exclusive stones, etc.
Whatever you choose, best of luck! :) --- 3DS FC: 3754 7732 9971 Fighting Safari - Meditite, Sawk, Tyrogue