Does anyone know how I could record this using OBS?

the "start recording" option.

I know that, but I don't know how to get it to come up as one of the sources

I´m assuming you have a capture card for your 3DS/DS or whatever you´re using correct?

i saw no reason to open up a new thread for the same issue so posting here. Im wanting to get into running these games and im just wondering how i actually go about getting a capture card for my 3DS. is it an external bit of hardware? any help on this is appreciated, cheers