Look my friend, everything is possible in cartoons, films and comics.
Think about Ultimate Alien X, someone above everyone including omnipotent beings in all cartoons, films and comics.
I think no one can create Ultimate omnipotent in other cartoons, films and comics, except in Ben 10 cartoon because they have Technology that can do that.
Again my friend, don't worry yourself with these things because they are proved.
Of course wikis are trusted. Also there is Ultimate Celestialsapiens and Omega Celestialsapiens and beyond that if you evolved them. In cartoons, films and comics everything is possible.
And Maltruant is not ultimate. There are off-beat aliens like (Maltruant, Albedo, Azmuth, king of Spidermonkey's species, emperor Milios, king of the Tetramands and many others). Usually these off-beat aliens are the kings of the species.
I showed you the answers, why do you worrying yourself with proved things?
No.If they do it.They will say cartoons authors are stupid don`t know what omnipotent means.Also authors can`t be stupid.Ultimatrix doesn`t even work when ben tranform into Alien x.Which wiki said Alien x have ultimate forms.Dwayne and matt both said Not all aliens have ultimate.