Pokemon: Season 20, Episode 31

The Island Whisperer!

Lychee, the Akala Island Kahuna, and her Lugarugan appear at the school just in time to stop a fight between Kaki's Lizardon and a Kentauros. She completely wins over everybody's Pokémon including Nyabby. The class and Professor Kukui will be traveling to Akala Island for a special practical class under Lychee's supervision. On the way, they encounter various types of Sea Pokémon. After Satoshi and Pikachu join Lychee in an underwater swim, they find a Hoeruko trapped in a rock crevice by a vicious Hagigishiri. Now they have to help the Hoeruko and fend off the Hagigishiri at the same time.