Dr. Yung

Dr. Yung is the creater of the mirage system in the 10th anniversary special: Mastermind of the Mirage Pokemon. He battled Misty using his Mirage Aggron, however when he battled Ash the mirage system appearently malfunctioned & was seemingly captured by Mirage Master. Professor Oak later reveals that Dr. Yung is Mirage Master. He goes missing at the end of the special.