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Negative, pleb.
Little brown girls are the best.
She became champion of Unova (America, essentially) which is the greatest region just like America is the greatest country. She was only a child when this happened, proving she has enormous innate talent which can only improve as she continues her Pokemon adventure.
She's an adorable little girl, a child-prodigy, with natural talent and a sweet personality.
She wears beautiful clothing and doesn't let her superior skills get to her head, instead she (sort of like the MCs) battles with Pokemon because she finds the entire concept fun.
She's the ideal Pokemon trainer, ideal loli and ideal champion. GF will never come up with a champion as amazing as little Iris.
tl;dr: little chocolate loli is best champion
Diantha on the other hand is absolute shit.