Gold/Silver/Crystal, have always been the best pokemon games in my opinion
Day/Night/Johto/Kanto, 16 badges, Fighting Red/Green
Background story about what had become of the:
Kanto Gymleaders, The Elite 4, Red & Green, Some of the buildings.
Now with this upgrade.. of quality in graphics as well as gameplay, It is quite clear that this game will be the best Pokemon game yet.
Actually I'm certain it'll be a long long time until these are surpassed.
UNLESS they come up with Clear Crystal.