At least Final Fantasy changes it up.
By Daniel Caissie in unsupported, Pokemon, complain, change on May 10, 2009
Is it just me, or does it feel like it's time to change the Pokemon formula a bit? Platinum released with a bang, and Nintendo have announced remakes of Gold and Silver for the DS. I don't think they see a need to try anything different.
But I'd rather play a Pokemon game that isn't one I've played before. I'm not talking about any of this Ranger or Mystery Dungeon nonsense. I'm talking about wiping the slate clean; completely re-working the formula for the main series. Of course, I don't have any ideas myself of what to do if such a change were to actually take place. But that doesn't mean I can't complain anyway.