>>51476393Specifically in the case of Black and White the anime was trying to mirror the game's marketing tactic at the time where it was a soft reboot with mostly similar elements to the original Red and Blue games, meaning the anime was trying to mirror the original series.
That's why Ash once again travels with two gym leaders around his age where one is an eccentric cook and the other is a bratty girl who constantly gets on his case for being a dumbass.
