You have one if you have the 3n1 from EZlink. I don't know the specifics on making that work with anything to be honest. I know the ewin works natively with rumble for DS games, i played the metroid prime games to make sure. So the 3n1 should prolly work the same. For the GBA games, I think you have to patch them to work with Rumble and/or use GBAexploader. Someone else would be good to ask for that. Basically though, the rumble pack just vibrates during ertain actions during the games that are compatible with rumble.