First you need and emulator and a compatible rom. After you have those two things down you will need something to record the game with I reccomend fraps if your are willing to pay if not use hyper cam. Once that is over with follow the instructions on how to work everything or watch a walk through on how to. If you did everything correctly you will be playing and recording in no time. The next best thing would be to put your leafgreen in your DS, setting it to play on the top screen and record with a good camera. It could take a while to set that up and it might be uncomfortable but its the next best thing.