Board Thread:General Discussion/@comment-92.18.122.55-20130124205503/@comment-26531060-20130125045117

Either 2 DSes (any will work if they have DS Download Play compability; the 3DS has it) with a Plants vs. Zombies card (an R4 with Plants vs. Zombies installed could work, too) to play Download Play or Wi-Fi connection to play Wireless.