User blog comment:Brian Dodd/Top 5 Most Powerful Omnitrix Aleins/@comment-24275755-20140404075936

If ultimates don't count:

1.Alien X

2.Atomix

3.Clockwork

4.Toepick

5.Feedback

If ultimates count:

1.Ultimate Ben

2.Alien X

3.Atomix

4.Ultimate Waybig

5.Ultimate Humungesour