In the TV show, they would be unstoppable.
If Joker and Black Mask Appeared and Teamed Up In Young Justice
I honestly believe that nobody can seriously team-up with the Joker. He has his own agenda and would be a threat to everyone. That's why you see The Joker double-cross Black Mask in "Under The Red Hood".
But, yeah, I think it would be a great episode. :)
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