Board Thread:Suggestions/@comment-30197419-20161011070334/@comment-25620113-20161012081335

Alien X's only limit is having the personalities in his head so I believe the only way a Celestialsapien could evolve would be to get rid of the personalities or split them up into different entities. There likely wouldn't be a change in appearance as they already are celestial bodies.

Though in all honesty I doubt the Ultimatrix's evolutionary function would work on Alien X. See evolution is a particularly tricky concept. We are all in a state of 'now' so we don't notice it as the changes gradually appear over millions of years  but we have evolved since those millions of years and will continue to do so. While this works for most of the aliens Celestialsapiens have presumably been like this since before time itself (They do live outside the universe). So if they haven't evolved  since  then there is likely no chance that they will do so in a few million years.