Yhwach, I'm not sure it's even going to be a fight. 

^{if the Demon King has a way to deal with Yhwach's ability to see the future and manipulate it to get a desired result that he wants, then the battle might be interesting to watch.}

@tope The demon king's ephitet abilitiy can revert anything or any ability and base on combat experience he's above or on par with ywach

I have to go with Ywach on this one, I honestly don't know enough about the demon king. Other than him being from seven deadly sins. And just what I know off Ywach I think he has this. But to be fair, like I said  I know nothing about the other. 

@konami31 But with Ywach's abilities couldn't he prevent that with his powers?