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I see people talking about the fact that Arven colud be the son of the new professors.
But what if the professors are just the paradox forms of Arven?
They are from another future/past timeline and they are researching about Pokémon that are just like them.
That's why She seems like a cave-woman and he is like that.
Clavell find Olim/Turum and help them in the research with money and resources.
Another intersting point is that Arven is intersted in the lore of Paldea.
Maybe he is a character like Volo in PLA, very friendly and playful and super obsessed at the same time in the lore of Paldea (that could explain why his paradox forms are professors).
Sorry for strange english lol