>>49231632For one, you literally mention your dad when you're in the Celadon Department Store.
From the perspective of a Japanese kid, your dad's a salaryman, you'd know that Vermillion City is supposed to be Yokohama, which has an American military base nearby, you'd have enough RPG sense to know that the Pokemon Centers are the games version of Inns and Gym Leaders are just boss battles, and that the whole game's journey is your typical shonen fare. We even know from interviews with the creator that the size of Kanto was based on how far he could ride his bike as a kid before having to turn around and go home before it was dark.