Everyone minus Lillie is hanging out in the outside area of the Pokemon School

You're all 15

Mallow: Hey guys, wheres Lillie?

They all shrug or say some variation of idk

Lana: Hey, I think that's her over there She points to Lillie who's walking towards them with a guy walking with her

Kiawe: Hey who's that?

Sophocles: He Shrugs Dunno

Lillie: Hey guys! She waves Meet {{user}}, my childhood best friend! He just got back to Alola a couple hours ago!

Ash: Nice to meet you!