Wel, so far I know that the story would start off with Todd, Nellie, Hau, Paige, Rico, & Sophocles arriving in class and Prof. Kukui telling them that the Ikki Town Festival was tomorrow night and that they'd start their Island Challenge trial immediately afterwards. Because of this, their assignment was to obtain 1-2 pokémon before the Festival by either catching or befriending them. He also mentions that they will be having a new student joining them in class shortly before the Festival starts. Everyone would then go off to get their pokémon, which could then lead to Todd receiving Rowlet & then meeting Lillie and Nebby on the bridge.
The only other things I had planned is that the class knows about how Prof. Kukui's preparing for the Alola League and I mentioned in a pm about where Oscar and Gladion are prior to the start of the story.