As a counter-point to <PERSON>'s answer: God can have a story arc albeit one with an obvious victor. For example: the Christian God <PERSON> takes human form (with the name <PERSON>) in the books Matthew, <PERSON>, <PERSON>, and <PERSON>. Since he is omnipotent there is no evenly matched opponent however there is an introduction, a goal, a journey, build up, a climax, and a resolution. There's even suspense at a few points.
<PERSON> had a desire (to save humanity) and antagonists (namely the pharisees) which stood in the way of the goal. Granted he was never frustrated by their attempts but certainly this qualifies as a story.
Although there are plenty of conflicts, all of them are one-sided. The trick questions given by the pharisees are easily and immediately answered. 72
And if you read the back story (the Old Testament) you'd know that by definition (of omnipotent) God can't fail. Which forms a weird plot armor in that we know that <PERSON> will die but he will also always succeed (even if painful). And that no force can even slow him down with temptation and death happening exactly as expected. And this exactly what we would expect from an omnipotent main character: people stand in his way but it in no ways hinders his progress.
Stories of a utopia are about a perfect place, writing about a perfect person has some similarities. Writing about a perfect place could have a purpose of "this is the perfect place and we should strive to make our society just like it" likewise writing about a perfect person could have the purpose "this is how a perfect person acts and we should all strive to be like him".
Pretty much the only stories about a perfect person are wrapped in either religion or philosophy because generally speaking these stories aren't as popular. A lack of challenge is considered boring and of course no reader can relate to a perfect person.
My answer answers "can it be done" (yes) and "why would it be done" for a perfect all powerful main character. As for viewpoint: it exists and is called an omniscient third person narrator (whether the narrator is a god or not). 999