The DS out

Post reveiws of games for the Nintendo DS, and your recommendations as to whether that game should be bought, rented, or avoided. Decisions will be placed up here. I have a few to start out with which I will post the reveiws of later.
All you get for this is brownie points and the satisfaction that you have helped prevent gamers from regretting their purchaces. * games are must plays. Please tell us where you bought the game and for how much.

Buy:
Nintendogs- ??
Pokemon Diamond or Pearl- pokemon
*Viva Pinata Pocket Paradise- ???

Rent:

Avoid at all costs: