Damian's Deoxys

This question is bothering me for some time. During final battle(s) with Damian in dream realm he has Deoxys in his team. I know that his virus is related to Deoxys but in game dialogs does not mention presence of legendary pokemon itself. Could this mean that Deoxys we face during battles with Damian is Damian himself? Is it possible that he somehow transform himself to Deoxys for limited time using pokemon’s DNA within him? Any opinions?

makes sense, after all his 2 last battles have the legendary battle theme