Specialty: Fighting-type

Details:
After completing Ilmia's challenge, when you return to Iki Town, Hala will challenge you to a battle. Defeat him and you'll get the stamp for your Trainer Passport which allows traded Pokémon up to Level 35 to obey, the Fightingium Z Crystal and he will give you access to the Rider Pager.

Island Kahuna Hala	Machop	Makuhita	Crabrawler
Battle Type Items	Level 15	Level 15	Level 16
	Attacks: Karate Chop Revenge Focus Energy	Attacks: Arm Thrust Sand Attack Fake Out	Attacks: Pursuit Power-Up Punch Leer
	Hold Item: No Item	Hold Item: No Item	Hold Item: Fightinium Z

Specialty: Rock-type

Details:
After completing the three Island Trials on Akala Island, Lillie will ask for you to take her to the Ruins of Hope. When there, Olivia will challenge you to the battle for the Grand Trial. Defeat her and you'll get the stamp for your Trainer Passport which allows traded Pokémon up to Level 50 to obey, and the Rockium Z Crystal.

Island Kahuna Olivia	Anorith	Lileep	Lycanroc
Battle Type Items	Level 27	Level 27	Level 28
	Attacks: Bug Bite Smack Down Metal Claw	Attacks: Giga Drain Ancient Power Brine	Attacks: Bite Rock Tomb
	Hold Item: No Item	Hold Item: No Item	Hold Item: Rockium Z

Specialty: Dark-type

Details:
After completing the two Island Trials on Ula'ula Island, and facing off against Team Skull in Po Town, then Nanu will introduce himself after helping you briefly. As Lillie gets kidnapped and you, Gladion & Hau head to the Aether Foundation to rescue her, Nanu will inform you that he is the Kahuna of Ula'ula island and challenge you to a battle. Defeat him and you will receive the Darkium Z Crystal and the Trainer Passport stamp that allows for Pokémon up to Level 65 to obey.

Island Kahuna Nanu	Sableye	Krokorok	Persian
Battle Type Items	Level 43	Level 43	Level 44
	Attacks: Power Gem Shadow Ball Fake Out	Attacks: Crunch Assurance Swagger Earthquake	Attacks: Power Gem Fake Out Dark Pulse
	Hold Item: No Item	Hold Item: No Item	Hold Item: Darkinium Z

Specialty: Ground-type

Details:
When you reach Poni Island, you will discover that there is no Kahuna on the island. The previous one, Hapu's grandfather, passed recently and Tapu Fini has yet to choose a successor. However, as you need to the Kahuna's help, Hapu goes to the Ruins of Hope to request a Kahuna be chosen and becomes the Kahuna. After defeating Necrozma and completing Mina's trial, Hapu will come to you and say to meet her on Exeggutor Island to have your Grand Trial. Now, Pokémon up to Level 80 will obey you.

Island Kahuna Hapu	Golurk	Gastrodon	Flygon	Mudsdale
Battle Type Items	Level 53	Level 53	Level 53	Level 54
	Attacks: Hammer Arm Earthquake Shadow Punch Stealth Rock	Attacks: Muddy Water Mud Bomb Recover	Attacks: Earth Power Dragon Breath	Attacks: Heavy Slam Earthquake Double Kick Payback
	Hold Item: No Item	Hold Item: No Item	Hold Item: No Item	Hold Item: Groundium Z