Kahunas are chosen and fight alongside “guardian deities” such as Tapu Koko.
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Kahunas Lead Each Island
Each of Alola’s four islands has a leader, called the island kahuna, who governs the island. Kahunas are chosen by the Pokémon known as guardian deities, which are also found on each island.
Hala is the kahuna of Melemele Island, where you have just moved to, and is also your rival Hau’s grandfather. His skill is renowned in the Alola region. He gives you your first partner Pokémon and expects great things from you.
Source: Pokémon Sun Moon.
Ici en français : Les Doyens gouvernent les îles. 😉
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