I have nesticle.
http://www.racketboy.com/retro/nintendo/nes/2008/03/best-nes-emulator-for-nintendo-ds-nesds.html
You will have to download an emulator. Once you are able to download this emulator, which can be for SNES, NES, N64, Atari, and many others, you will have to download roms. Roms are the games for the emulator. So if you download battle toads, you will have to open it with the emulator you downloaded.
Yes sites like amazon and eBay always have them for sale, but that's if you have money to spare because its quite expensive because of its rarity, its cheaper just to download a NES emulator and download the Earthbound ROM which is all free to download
no
No, you must jailbreak and get cydia to be able to download an emulator.
The best PS3 Emulator can be found on the Emulator Zone website. The download on the site is called rpcs3, it is for Windows and is a free download. It has a 3.5 star rating.
If you jailbreak your itouch you can download third-party applications like the NES emulator and you can get themes and other cool stuff.
A gameboy.
According to the reliable website, The Emulator Zone, there are three top programs to choose from that score the highest at 8.5 out of 10. Jnes Nestopia FCEUX
The related link is the best download location
No, only SNES ROMs work on SNES. You need a NES emulator to run NES ROMs.
nowhere