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I think i know what's the problem, we just need more information, here is my theory
>in Gen 9 the characters will go to pokemon school which is why they wear the same uniform
>they will ask you stuff similarly to PLA like ; today's homework is going to open area 1 and catching this pokemon
.>our rival could be from another pokemon school, maybe every school picks their best student to go on a tournament and then the winner of that tournament gets to battle the elite 4 for a chance to become a champ