The DS is perfect for Pokemon
Pokemon Diamond is one of the best games on the DS, whether you're a newcomer to the series or an experienced veteran. The battle system has been tweaked a bit, with new abilities, attacks, and the first real distinguishing between Physical and Special moves.
The game also allows you to transfer Pokemon from the GBA games like Emerald and LeafGreen, which really helps, because there's 493 Pokemon this time around.
You'll have plenty to play in Pokemon Diamond. Contests have gotten a massive overhaul, including new events. The new battle system makes real use of a Pokemon's stats, and strategies have changed. New monsters to collect and trade with friends add a whole new meaning to "Gotta Catch 'em All", and the competitive metagame is deep, whether you're training with advanced things like Effort Values, breeding, or anything.
The game's graphics are gorgeous, though nothing compared to the remake, Pokemon Platinum. Sound quality is also good, and a lot of the themes are catchy as the dickens.
The plot seems slightly re-hashed from the Hoenn region, and some areas are bland, but overall, this game's a near-perfect DS adventure.

nr.1
pokemon is so nice. like the others i have enjoyed this pokemon game. and pokemon platium is VERY nice too.any pokemonfan MUST OWN IT diamond or pearl. both are nice.

IT ROCKS
no doubt the best game for DS (though Pokemon Platinum is way better)its a must buy for all pokemon fans im not kidding,i love it my self,if you buy it you'll be in heaven no lie :)

Best Pokemon Game EVER
I can't believe how much fun this game is! I, like many others here, have grown up playing the Pokemon games, so when I picked up this game, I thought it'd be just like the classics. Guess what? I was completely wrong!

With lots of new Pokemon, new features, great side missions and awesome graphics, this game will have you absolutely hooked. I'm not kidding you, I've played it for almost 40 hours now and I've only had the game for 5 days!

If you must buy one game for your DS, I highly suggest you buy this one! I guarantee you won't regret it!

BestGameEver
As a Pokemon fan for many years, this is one of the best games I ever played. The graphic, system and the music is awsome!
Even if you're not a fan, most of you would definitely enjoy it.
What I liked about it is that you can trade worldwide =D