For sale or for trade: PassKey 2 (it was a PassKey 1) that I flashed by JTAG for PassMe 2 code. The game it works for is Mario Kart DS (U). Don't know what (U) is, look it up on PocketHeaven Wiki. I will throw in the CheapTAG cable I used, you just need the (free!) Xilinx WebPACK to flash it. You can get the code to flash to it for any DS game from DarkFader's website.
You need a GBA flashcard with SRAM to use this.
It works great (just missing one screw), I even have the box.
Want $15 shipped for it because I have the cable. Also taking trades.