Pokémon the Series: Sun & Moon Episode 74: Tough Guy Trials!
Episode 74 of 146 of Pokémon the Series: Sun & Moon, aired May 10, 2018, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Ash can’t contain his excitement as he arrives on Ula’ula Island for his next grand trial. But Nanu, the island kahuna, has other ideas and leads Ash to believe someone else is the kahuna.