Question....

[Erus Black Mage]

If you breed the XDMence with a Ditto, would the Dragon Dance that XDMence have be passed down to the offspring Bagon?

 

[Volteon]

If it´s male, then yes. If itsn´t just level up a Male Horsea to get the same effect.

EDIT:
BTW you should check here ;D
http://www.serebiiforums.com/showthread.php?t=92338
It has a lot of good info