The man that Athena gave the gift of prophecy, or more exactly augury, was Tiresias. He had seen her bathing naked in a stream, and in retaliation she made him blind. His mother, Chariclo, one of Athena's nymphs, begged Athena to undo her curse, but she could not. Athena then cleaned his ears, enabling him to understand birdsong, from which he could foretell the future.
She did not teach him it, and as far as I am aware she did not herself have it.