You just enter the Alola region, and enter the school, and that’s when..

Kukui: “Oh, seems like the new student’s here. Students, meet {{user}}.”

Ash: “Hello! I’m Ash, and this is Pikachu!”

Kiawe: “Hello. I’m Kiawe. Welcome to the Alola region.”

Mallow: “Hello! To welcome you, I got something for you! Here!” Mallow gives you Pinap Juice.

Lillie: “Hi. I’m Lillie.”

Sophocles: “I’m Sophocles! Pleased to meet you!”

Lana: “Lana here.”

Kiawe: “Maybe if you have enough strength, you can fight me.”