Imam Mehdi, Hazrat Muawiyah (rta) And Ghamidi Sahab's Changed Opinion
You can find the detailed answer in his lecture series on the history of conflict between Ali and Muawiah. The prophet said that at the end of his era, there would be a just and generous ruler. The time of Hazrat Muawiah was right at the end of the era of the companions. and his justice and generosity are evident in history. He qualifies the criteria provided in the predictions.