Spiritually speaking, what makes the son of Yashoda the omni-potent and Divya Parmeshwara ?

Every yogi who has attained dharammegh samadhi is yogeshwar like Vyas Muni etc. it makes no different whether he is called yogi or rishi or muni, etc. Shri Krishna also learned four Vedas and did practice of ashtang yoga and called yogi/yogershwar/bhagwan etc.