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>gym leaders are one-dimensional and have no development
Golly gee, it's like the game is focused on the player and not these literally whos. Gym Leaders are, were, and always will be, glorified hurdles for the player to jump over. Attempting to develop them like in B/W only lengthens the walls of text the player is forced to read.
You know what happens then? You get what they did for Sun/Moon. S/M was basically The Lillie Experience™, featuring (You) as The Babysitter because (You) wanted character development in a goddamn Pokemon game.