If you could see an alien go Ultimate on Ben 10, who would you like to see, and what would their form and abilities be like. If I could choose I would like to see Ultimate Diamondhead, Ultimate Ditto, or Ultimate Toepick
placing the selected species in a simulation, right down to the DNA, for an extended period of time, about a million years or so, in what is described as a "worst case scenario"; the actual DNA is then simply modified to match the new DNA. This survival of the fittest routine explains why the ultimate aliens are more combat-centered than their normal forms.
Alien X can easily live a million years,So he doesnt need to be combat-based