Board Thread:Questions and Answers/@comment-24685938-20160430172815/@comment-24685938-20160501075634

Blaziken rjcf wrote: Omnipotent means capable of doing anything. It does not mean "without weaknesses". One does not follow from the other. A being can have no weaknesses and not be omnipotent, and, likewise, a being can be omnipotent and still have weaknesses. They could be psychological or physical, but omnipotent does not mean "lacking in weaknesses".

As for why a character did/didn't do any number of actions, you'd have to ask the writers why they decided it that way. My guess is, they thought it'd make for a more interesting story. But wait? Being Omnipotent means there can only be one in each continuity? It stated on the superpower wiki that to be omnipotent you are "fundumentally" invincible. So maybe Alien X and  Atomic-X are actually nigh-omnipotent after all?