You can play NBA 2K9 with a standard Wii Remote, but the experience will be severely limited. For full functionality, you need a Wii Remote Plus (or original Wii Remote with MotionPlus accessory).
Basic menu navigation and simplified "classic" control schemes may work, but core gameplay—especially shooting and dribbling—will feel broken or unresponsive.
Use a Wii Remote Plus (model RVL-036) or attach a Wii MotionPlus accessory to an original Remote. The game was designed around MotionPlus; playing without it defeats the purpose of the Wii version's unique control scheme.