The Ontological Argument - valid or debunked?

[LostLocke]

By that token.... with omnipotence alone, a maximally good being would be required to prevent all evil in all possible worlds. Since that is not the case in this possible world, that would mean a maximally good being does not exist.

That would be a defeater except the Problem of Evil argument is not successful.

I made no mention of the "Problem of Evil".
All I'm saying is that if you're saying that a maximally good being is not required to eliminate all evil in all worlds in which it can exist, then a maximally evil being is not required to eliminate all good in all worlds in which it exists.
To state otherwise is just special pleading.