I still think Ash won't have one, it's way too late in the series, every main rival he's gotten is at the beginning and we are already what 9 or 10 episodes into the series. Hey'll just get random rivals that will appear later on in the league.
It's not that late in the series, but I agree that the odds of him getting a rival are slim at this point. And like I said, it's not like he totally needs one either. If the writers motivate Ash in order ways, I don't see why he would need a rival to push him to do better. After Trip and some of the other BW rivals, I'll be really glad if the writers don't repeat their mistakes in XY.