While I'm in the wait for Smash Bros and Omega Ruby for my 3DS, my IRL friend let me borrow Black 1 version in order to bring my pokemon from Platinum/HeartGold/SoulSilver into Omega Ruby once it comes out. I have loads of legit and event pokemon I can bring over. Even my first Sceptile that came all the way from Emerald.
The question remains, even though I don't have X or Y, can I be able to open a Pokebank before getting myself Omega Ruby? I hear Celebi is still distributive until the offer ends at the end of the month.