Spolier alert! The hidden info may spoil your fun of playing.
As soon as Noah steps outside, he meets with Iza. Iza's family runs up and explains to Iza (and Noah) why they can't see each other, and why they have to leave town, right now. Iza runs away, and Noah finds her first, but a Bulbasaur comes out of the tall grass and protects Iza (at least Bulbasaur thinks he is). After the fight, Bulbasaur gets injured. They give him a potion. After hanging out a bit, Noah heads home and talks to his dad. He is sent to the Hoenn Pokemon Acadamy.