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>handing out Pokedexes to promising young trainers is an aura contract
>the kids get them for free, become supernaturally lucky and get some of champion Oak's battle instincts
>the Pokedex stores the aura they develop in their journey
>as soon as you step into the Hall of Fame old Oak is there to collect
He also spends MONTHS fucking your mother in order to make his aura more compatible to yours when it's time to absorb it, btw.