[ Well, it sounds like I could try combining our ways. When it's weak, Exp. Share to prevent constant switching, and Lucky Egg when the Pokemon is strong enough to hold its own.
Oops, I didn't count on you not knowing that yet... Post-game, if I recall it right.
I just think she's bland, there's nothing that sets her apart from the other Champions, in my opinion. Lance has his role in the anime's Red Gyarados arc (G-Men), Wallace is the graceful Coordinator who worked himself up from Gym Leader to Champion, Cynthia (not my favourite, because I think she's a total Mary Sue in the anime, but still worth mentioning) has her interest in legendaries... There's not really anything that makes Diantha's personality or role in the game interesting, in my opinion. She just seems bland to me.
Well, this shallowness is why Cynthia, Skyla and Elesa are probably the three most popular PokeWomen among many guys...
From those three, I'd say Cynthia is slightly interesting in the games, but too overpowered and perfect in the anime. I think Skyla is cute (also behaviour-wise) in the games, but arrogant in the anime. And I don't like anything about Elesa.
Do you also see this shallowness for female fans and male characters often, or just guys and female characters? ]