UP FOR SALE IS A Very rare and AUTHENTIC Pokémon CELEBI distribution NTR-Y8CE-USA cartridge that distributes 

This cartridge has never been damaged or repaired and is in excellent condition. The cartridge number is # 5155 as shown. 

If you know the history of these, the distribution cartridges are rare and even harder to find undamaged. 

It will work on any Nintendo DS, 3DS or 2DS system. Information on the dates needed to be set on the system for distribution

 can be easily found online.