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I feel like part of the issue with diantha, is that the most interesting aspect of her character is something you literally cannot show in a game like pokemon.
Diantha was an actress who became a pokemon trainer on a lark and somehow became the best trainer in all of Kalos. That would be an interesting story to show, but you cannot do that in a game that you see her for all of a few seconds and is not even about her in the first place.
