Here's why:
* Shadows of Almia is a DS Lite game. It requires the larger screen and enhanced features of the DS Lite console to function properly.
* Regular DS consoles lack the necessary hardware. The original DS doesn't have the processing power or display capabilities to run Shadows of Almia.
You can, however, play Pokemon Ranger: Shadows of Almia on the following:
* Nintendo DS Lite
* Nintendo DSi
* Nintendo DSi XL
* Nintendo 3DS (using the DS game card slot)
* Nintendo 2DS (using the DS game card slot)
So, while you can't play it on a standard DS, you have several other options to enjoy the game.