Warning: This game is highly addicting.
Ok, I think I'm officially obsessed with this game. After 115 hours of gameplay, I can tell you this game is a superb entry into the Pokemon series. By ds standards, this is a nice looking game. The day/night feature is something the franchise lost after G/S/C, but it's finally back! Personally, I'm not a huge fan of the pokemon in this region, but the game is heavily addicting nonetheless.
The game is much better if you have people to play with. Friend codes are a pain to work with, but if you can find friends to battle and trade with the game becomes more functional and fun.
Get this game, but be warned: once you start it, you'll be hooked.