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Shauna was alright. If not just for her cuteness points and the fact that she's actually somewhat involved in the plot.
Calem/Serena was a waste of a potentially interesting character. They could've done interesting things with their jealousy, like making them use underhanded tactics to win or outright attacking you to try and prove they're better or whatever. It would've added a nice conflict between the protagonists. But nope, they just angst for like, 3 lines of dialogue and get over it, going back to their boring-ass old selves.
Trever didn't do jack shit, his pokedex comparing shit was annoying, and i'm sure it's literally impossible to lose to him when comparing Pokedexes. I beat him once with fucking 12 Pokemon registered for that area.
Tierno was so fucking retarded that it's sad. Every line of dialogue is about dancing, yet NONE of his fucking Pokemon have anything to actually DO with dancing, and is just useless overall. They mentioned that he's super insecure as a trainer, and if they built on that to add conflict and have him shut the FUCK up about dancing every now and then, he could've made an interesting character, but nope, he's a piece of shit through and through.
Mostly everything about Gen 6 is really good, but I can see they really didn't try very hard at all with the plot and characters.