Harry,
If one were to ignore this fact and assume that it was a logically meaningful statement, the answer is still no.
If you say no, this seems to suggest that god is no longer omnipotent. however, once you look into this, it is clear that in fact yeilding to this suggestion does not have any effect upon God's power. Saying that God cannot do this simply means that God cannot exceed his ability to lift rocks when he creates them. god's ability to lift rocks remains infinite, and as a corrolary, so does his ability to make them heavier and heavier, so long as he can lift them. Thus, God's omnipotence remains untouched by such an admission.
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