Hack in event pokemon. That is what I do. I don't have time to constantly check in on serebii for a year or two after release. After the first few months I will move on to another game and not play for a few months until I pop it back in.
By then I will have missed a few events and so I cheat them in with the moves from the event and any items they were holding in the event and I just randomize the IVs.