Gen 5 already had DLC characters based off the anime characters like Virgil for the PWT. We've had Ash's Pikachu as an event. We've have an Egg event based on the Pokemon Egg as got in Unova. We've had various gift Pokemon based on Pokemon from the movies, not just legendaries, but Pokemon that characters in the movies have had as well. The Japanese events are largely based on going ons in the anime in general, actually.
Imagine if Ash was available as an NPC traveling around the reigion randomly each day to fight over and over with a really high level team of his best Pokemon, being rotated around. Or if there was an event ingame where you had to fight against Gary, who is for some reason with Oak on a research trip as a way for him to let off steam after doing tons of investigative work on the "new Pokemon".
Really though, it excites me to think that the BGM in Gen 6 could possibly be this amazing based on what we HAVE heard already.
Currently playing: Pokemon Platinum(493/493 now a 3 Star Trainer!), Street Fighter 3(Xbox online), Rocket Knight Adventures(Sega Genesis)