I remembered and edited it, but I guess I was too slow. Anyway my point being that there were far less important characters like the Flare scientists getting unique animations while Diantha didn't.Actually, the Gym Leaders and Elite 4 all had static intros. Rivals, Team Flare members, AZ, and Sycamore I think were the only ones with animations.
I still believe it is a champion intro though, the whole rainbow effect feels like a proper conclusion to the Island Challenge.