First of all, props on that image. Seriously.

The first issue that I can see is the natural life drain. We all know that that is Yveltal's signature, but recall that the avatars are (for the moment at least) much weaker versions of their Pokemon selves. This is just my opinion (final call is with Zanavy), but perhaps change it to that contact is a slow drain, and a very short range? 

Also, I know it's a measly two levels, but the starting limit is 30. Just to be fair to everyone.

Otherwise, loving the contrast you have with Tantalus. The Homeless Man of Destruction vs the Lifegiver with a God Complex.