Everybody with an Android does it in school right now.
You can actually play a game for a Gameboy on your phone with all the features and stuff and I really want to play Pokemon because I gave the gameboy to someone else years ago :c
Here's the problem, you've got to go to Android Market and download something called 4share, then you've got to download stuff like ROM.GET. and go to some other website and download INC.TOOL or something and so on.
How do I know I won't get any viruses?
And I guess it's legal, since I bought the same Pokemon game years ago. (Pokemon FireRed)