I have been asked countless times about a Nintendo and Gameboy Emulator for BlackBerry Devices. I wanted to set the record straight that there is an emulator that can be downloaded at PinStack.com which uses the vNES engine to run a few classic Nintendo games such as Super Mario Bros. Keep in mind this is not a commercial release so it does not work amazingly well but it does work. Hopefully another vendor will release a real emulator for BlackBerry but currently you can find the emulator at this link. You have to register at PinStack.com to download the emulator. If you have any issues just email me using the contact link on top of the page and I will email it to you.
NOTE: You may need to lower the framerate to make the game playable on your BlackBerry. Play around with it a bit until you get it to work. You will also need to map out the keys so that they make sense.