Obviously, Damian isn't the original Dialga. He was made after a time warp the original Dialga did and then, because of an error of the original Dialga, he was created and now is considered the alternative son of the original Dialga. He don't see himself as superior as the original because he's more weaker than the original but he can make a good job on changing possibilities and warping the time. He lives with the mortals because of a mission that the Original Dialga gave him...