There is no logical flaw in the question itself.
An average man can create a cement block that he cannot lift. He poses the power to create the block with specific properties yet does not have the power to lift it.
An infinitely strong man would be able to lift any rock created yet he could never create a rock that he could not lift.
As you see both men are limited in their abilities because of their condition. One can do what the other cannot and vice versa yet neither is omnipotent.
Now an omnipotent being is a being that has the capabilities to perform any action. It has unbound power. Hence, by definition, there is nothing that an omnipotent being could not do and it should be able to both create a rock it cannot lift yet lift it at the same time - a paradox that arises not from the question, but our definition of omnipotence.
So the question has no logical flaw, but exposes the flaw in the concept of omnipotence.
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