yes, you need a passme 2 device, such as m4-mini, passcard 3, superkey, etc...
The benefit of having mk4-mini is that it will work with your mk2 directly (no need to flash your ds lite).
There is also a mk4 sd and a neo2 flashcart coming in the next few months (they will likely have much better speeds and compatability than your existing mk2)
BruceG