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1. Fight on earth
2. Fight in dark realm

Who wins?

Can Mephisto or Blackheart be killed or koed?
Maybe Onslaught's reality warping powers can affect them.

I may have to say Mephisto and Blackheart win in both. Apocalypse isn't as powerful as one would suspect and Mephisto made his son way too strong, to say nothing for Mephisto himself. I see the X-Men villains winning a few on Earth, but they lose a majority. In Mephisto's realm, I'd have to say Mephisto and Blackheart 10/10