It comes in a pack of three.
From left to right these Pokemon are: Tepig, Snivy, and Oshawott. Tepig is the fire type Pokemon, Snivy is the grass type, and Oshawott is the water type. In the game, I chose Oshawott. A-ee bought the set for me.
You can use the three of these on any kind of Nintendo DS, like DS, DSI, and DSI XL.