More pokémons, more time playing
Anyway, the graphics for this game, though not spectacular, they do the job well. Plenty of colours (You people spell this as "colors") and the looks of the Pokemon have been improved.
The sound in this game are pretty similar to the previous Pokemon game (Pokemon Centre music still has the same tune but it's been changed a little) and some music are quite catchy. I like the music when you go up against a gymleader (Pity you can only hear it 8 times).
However, once you win this game, you don't really have as much to do as you had in Gold and Silver. Sure you still get to capture a powerful level 70 Pokemon and get to go up against the Battle Tower but it really gets boring from then on.