Board Thread:Questions and Answers/@comment-24546423-20140318103705/@comment-5543071-20140414144643

With the way the Omnitrix works in Omniverse, one can't really say that Ben chooses an alien because it's more powerful than another. He seemingly gets random aliens that happen to work in the situation. Besides Rath. It seems like Rath's appearances and battles are usually not suited for his strengths.