All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu 'alyhi wa sallam, is His slave and Messenger.
This claim is false and appears closer to an attack of insanity, rather than the attributes and miracles of Awliyaa’ (close slaves to Allaah The Almighty) as explained to us.
If a person is observant and steadfast in doing good deeds, then he may be a Waliyy. Moreover, Allaah The Almighty may enable some persons to perform certain paranormal acts, but only the ignorant are deceived by them into believing that they possess divine abilities.
Al-Khidhr is not alive any more. This is the dominant opinion of scholars. Indeed, even if we suppose that he is alive, then he will not know what will happen in the future, because this is the knowledge of the Unseen, which is exclusive to Allaah The Almighty.
Allaah Knows best.