Yes there is a Game Shark for the Nintendo DS system.
The Game Shark for the DS is only a Game Save device and not a cheating device. The link I provided you (see below) is a 2 in one pack. The other device inside the pack is for the GBA games and its the latest GameShark device. You can use the GBA part in your GBA or GBASP or GBAMicro!
Link to official product!
It seems that the product is on back order at this time and they are waiting for the factory to make more so you are unable to order online but you can also find them at any store that sells Games like Walmart ;)