This video shows you how to download DS roms (games) and put them on a R4 card & then put into a DS Lite
Free download games

This is a must watch video!
All you need is a 1GB or 2GB microSD card , a microSD adapter R4 card, Nintendo DS Lite or Original, PC-computer.
PLEASE NOTE 4GB & 8GB, 64GB micro ds cards WILL NOT WORK
You will also need to download WINRAR in order for it to work which is really easy just watch the video