Emulation is better explained through wikipedia although you will find a small summary to this awesome new world. Emulation is basically being able to play games of all platforms on your computer, yes whatever system you want, yes whatever game you want. If you choose you can even make a customized version of your game using rom hacking tools such as Advanced text editors, and so on.
Warning: Do not abuse emulators, before you download make sure the site you use is safe and approved. And make sure your computer can handle the emulator and rom itself, especially when you use very powerfull ones like the X-Box 360 and Wii. I have listed the two sites i use as i know they are safe.
Step 1: Getting Your Awesome Emulator Set Up.
1.Head to the Emulator-Zone.com
2.In the left hand corner choose your game system. Note: when choosing game boy click gameboy advance and not virtual boy.
3.Pick the choice of system and hit Download Now.(try to choose the one that best fits your computers graphics card and memory).
4.I prefer to save mine in a folder marked Emulators.
Step 2: The Roms... Yeah!!!!!
1.Head on over to Doperoms.
2.Type the name of your game in the search box.
3.Hit the download now box. Hmmm Dejavu?
4.I like to make a folder for my VBA roms.
Note: the file in the last picture with the starwars background(i know dont judge me) says Visual Boy advance Roms.
Note some site might not have the roms you want so just be patient and look around.
My top 5 Recomended roms.
Pokemon Chaos black.
Pokemon Fire Red.
Kirby Nightmare in Dreamland.
Step 3: Setup and Configuration.
Remember to extract the file or the game wont load.
Next go to options>joypad>joypad configuration. Try to get the joypad as comfortable for you as possible, but try to keep it in the same format as the game controller.
Then if your a cheater like me <=( im ashamed. then go to cheats>cheats list> and input cheats.
Note Make sure the cheat goes with the right format, I use gameshark.
Step 4: Warnings And...Stuff
Ok maybe not but still please dont kill your machine.
To check if the site is safe.
Make sure your system can handle all of this awesomness.
And finnaly check to see if your computer has the proper sleeze detecting software, in case of some icky virus.
Thanks and vote for me.