Hapuu

Hapu is the island kahuna of Poni Island. She specializes in Ground-type Pokémon. She grants the Poni stamp to Trainers who defeat her.

Hapu is a particularly reserved individual. Since her grandfather's passing, she has grown accustomed to spending her days by herself. She is often seen harvesting Poni radishes to relive the days she spent with her grandfather. However, in That's Some Spicy Island Research! (SM104), after encountering Ash and his classmates, Hapu was initially defensive, though she began to open up to the students after learning they also deeply cared about Pokémon. In her following appearances, Hapu tended to accompany the group and even invited them into her home while they were completing their school projects on Poni Island. She tends to act stoic and denies being lonely, claiming she feels comfortable being alone even to her own Pokémon.

She holds herself in high regard and speaks in a rather sophisticated manner, using longer and old-fashioned sentences to express herself. She is also quick to judge others, such as when she assumed Ash was the one behind the theft of her radishes, despite having no evidence to support this. Upon being proven wrong, Hapu is also able to easily and quickly recognize her mistakes and apologize. At the end of A Grand Debut! (SM109), she even agreed to battle Ash again just for fun, something she wouldn't do before.

Being the granddaughter of a former island kahuna, Hapu possesses great, intimate knowledge behind the concept and true meaning of being a kahuna, while also showcasing vast knowledge about the myths surrounding Tapu Fini and its abilities. She is an impassioned battler who seeks to truly challenge any opponents to prove their worth. Her dedication to her island's history and traditions led Tapu Fini to recognize Hapu as being a worthy next island kahuna in A Grand Debut!.

(Source: Bulbapedia)