>>55207864>Why does Terapagos fart a cloud of purple smoke to summon the professorShort answer: because it wanted to.
Long answer: we don't know. We have no idea what its goals are or what exactly it can even do, we can only theorize. Maybe tries to "fix" the world by improving each iteration of universes parallel to each other. Maybe it's literally Kismet - an avatar of fate that ensures things happen the way they are destined to. Or maybe it's just for the lulz.
There's a possibility the anime will tell us more but I wouldn't count on it.
>Why do you get immediately kicked back to the title screen afterward and wake up in your bedBecause its the same kind of thing that Heath experienced. He met someone "as if in a dream" and then woke up somewhere with vague memories of it, but had a physical object from the encounter. So what happens to us is similar. In universe, the MC might even not remember what happened - which would explain why they don't say anything when Arven sees the book and goes "Did you borrow that from the library? Haha cool!"
However, that doesn't really answer anything. Did the MC actually meet the professor or not? If they didn't, there did the book come from? If they did, why did Terapagos apparently teleport the MC to their fucking room after? Or was the MC so fucking baffled by what happened that they went straight to bed or some shit?
As for the title screen, it's definitely just to drive the point home about how the Book being back is a weird paradox because it's the same book that Arven gave us and then put into the time machine.
The book (and a Poké Ball on top for some reason?) is in the title screen when you start the game with no music, and it seems like it's early in the morning. Then, after you finish The Way Home, the book disappears, it seems to be noon and the usual title screen music plays.
After you meet the professor, it's suddenly evening and the book is back. The music turns slow and somber.
It's fucking weird either way.