Lets see...most DS games ever created that include multiplayer.
What I liked:
-Mario Party (everyone can play the full game on one card? yes plox)
-Clubhouse games (tons of fun little games, and you get the full list of games single card)
-Mario Kart (listing the obvious)
-Tetris DS
-Bomberman Proper (has a good amount of modes and powerups, however powerdowns aren't optional, and all stages are two screened)
-Bomberman: Land touch 2 (lots of stages that can all be reduced to 1 screen, or kept at 2. Doesn't have a whole lot of powerups though)