Pokémon Ultra Sun and Ultra Moon/The Island Challenge

The Island Challenge replaces gyms in Sun and Moon and Ultra Sun and Ultra Moon: It involves traveling to each of the four islands of Alola: Melemele Island, Akala Island, Poni Island, and Ula'Ula Island.

It is also mandatory to complete a trial, led by Alola's seven trial captains. Each trial involves a unique challenge, followed by battling a Totem Pokémon. Before the battle, Totem Pokemon will usually get a raise in stats. Once the Totem Pokemon has been defeated, the trial is considered to have been completed. You will also have received a Z-Crystal. Once all trials on a particular island are finished, you must battle the Island Kahuna, a strong trainer, in order to progress to the next island.

List of trials:

1. Ilima

 * Location: Verdant Cavern
 * Specialty: Normal
 * Challenge: Locate and battle 3 Pokemon.
 * Totem: Gumshoos (Ultra Sun), Alolan Raticate (Ultra Moon) Level 12
 * Boost: Defense

Kahuna: Hala

 * Specialty: Fighting
 * Pokemon: Machop (Level 15), Makuhita (Level 15), Crabrawler (Level 16)

2. Lana

 * Location: Brooklet Hill
 * Specialty: Water
 * Challenge: Find and battle 2 Pokemon.
 * Totem: Araquanid Level 20
 * Boost: Speed

3. Kiawe

 * Location: Wela Volcano Park
 * Specialty: Fire
 * Challenge: Identify the differences between two dances.
 * Totem: Marowak Level 22
 * Boost: Speed

4. Mallow

 * Location: Lush Jungle
 * Specialty: Grass
 * Challenge: Find 3 ingredients for a special dish. If you chose an ingredient that a Pokemon has had an eye on, you'll be forced to battle that Pokemon.
 * Totem: Lurantis Level 24
 * Boost: Speed

Kahuna: Olivia

 * Specialty: Rock
 * Pokemon: Anorith (Level 27), Lileep (Level 27), Lycanroc (Level 28)

5. Sophocles

 * Location: Hokulani Observatory
 * Specialty: Electric
 * Challenge: Complete a minigame involving moving Charjabugs into certain patterns.
 * Totem: Togedemaru Level 33
 * Boost: Defense

6. Acerola

 * Location: Thrifty Megamart
 * Specialty: Ghost
 * Challenge: Take a picture of the Pokemon messing around the store and Mimikyu.
 * Totem: Mimikyu Level 35
 * Boost: All stats

Kahuna: Nanu

 * Specialty: Dark
 * Pokemon: Sableye (Level 43), Krokorok (Level 43), Persian (Level 44)

7. ???

 * Location: Vast Poni Canyon
 * Specialty: Dragon
 * Challenge: Battle Jangmo-o and Hakamo-o while heading towards the Z-Crystal stand.
 * Totem: Kommo-o Level 49
 * Boost: All stats

8. Mina

 * Location: Vast Poni Canyon
 * Specialty: Fairy
 * Challenge: Battle Mina, and rematch all of the other Trial Captains to receive a petal from them. (Excluding Lana)
 * Totem: Ribombee Level 55
 * Boost: All stats

Kahuna: Hapu

 * Specialty: Ground
 * Pokemon: Golurk (Level 53), Flygon (Level 53), Mudsdale (Level 54), Gastrodon (Level 53)