Dr. Kukui

ククイ博士, Professor Kukui, The Masked Royal
Professor Kukui Japanese: Dr. Kukui is a major supporting character of the Pokmon anime in the Sun Moon series. He is a Pokmon Professor in the Alola region and a teacher at the Pokmon School on Melemele Island. He is also the true identity of The Masked Royal Japanese: Royal Mask. Source: Bulbapedia