An omnibenevolent, omniscient, omnipotent being is a pretty incoherent concept.
For example, can God make a stone so large he cannot lift it? The usual answer to that one is that it's a logical contradiction. God can make a stone of any size, but he will always be able to lift it.
I would say that the question itself is incoherent, but the concept of an omnipotent God is not necessarily incoherent (depending on how you define omnipotence). We can reasonably assume that the definition of "omnipotence" includes the ability to lift any size stone. Therefore, your hypothetical stone that an omnipotent being can't lift is logically impossible. It cannot exist -- it is nonsensical, like a square circle or a married bachelor.
Your question could be rephrased as: Can an omnipotent being cause something to exist that can't exist? Or more generally: Can an omnipotent being do something that can't be done?
If you define omnipotence in such a way that your answer to that question is "yes an omnipotent being must be able to do the logically impossible," then we have no basis for talking about such a being (it is outside of logic and we are entirely constrained by logic). That would be our own shortcoming, and unfortunately would be the end of an otherwise interesting discussion.
However, if we define omnipotence as "the ability to do anything that can be done" rather than "the ability to do anything, including the logically impossible" it alleviates the problem and we can carry on. Similarly, omniscience may be defined as "the ability to know anything that can be known."
-Bri
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