Okay, at least you are getting it. So anyway....
I got SoulSilver, but they're basically the same game (like any other Pokemon game). Lots of features return from D/P/Pt, as well as the Rocket Storyline from GSC, obviously. Personally, I loved the music in this game. Also, it comes with a Pokewalker, which is a pedometer that you can walk around with a pokemon in. Pretty cool, but you can only go up one level each walk. Although, you can get some pretty rare Pokemon and items off of it.
tl;dr: AWESOME. GET THE GAME.