Bear with my grammer if it gets bad.w if you want free pokemon or yu-gi-oh DS games here is a guide to playing them. Step1: downlode the emulator its what runs the game. and there is nintendo 64 emulator to play the legend of zelda and what not but only if you have a good computer or good FPS.and this is my fave web site coolrom it have up to PS2 games and many more.the thing is.......what is your fav game?
Step2: download a game well idk there is many ways to get the DS or gameboy advance games here is the list of websites.
site2:romulation. NOTE:if your going to downlode a game look at the region before downloading.
and now before i end this ill show you how to start it its just a simple drag then drop from the game you just downloaded to the emulator now have fun but dont have to much fun ^_^.