>>22728751He was made easy as fuck so there's practically no chance of losing to him. I mean, you can, but given you just beat the elite four you'd have to go out of your way or be functionally retarded to do so.
If they don't make him champion (which would be pretty weird I'll admit), they should either toss the idea that you shouldn't be able to lose to him then aside completely, or add a postgame battle where he actually puts up a fight
and uses death flower Flowette. Or possibly make him the final trainer you face in the same way Ghetsis was in B/W1, basically taking the place of a champion while not holding the title for story reasons.