if you mean a gba emulator (gba = gameboy advance ) the best 1 is vba (visual boy advance) and you can get rom's for it on romulation.net
gameboy advance (gba) is a good emulator and you should have na problem with it....
There are a few good games cube emulator on a phone. You can find these games in the play store.
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4 shared and Emu Paradise are good sites to download the No GBA 2.6 emulator. Techspot is also a good site to download the emulator.
Yes, just make sure the emulator doesn't have a virus look around for one with good reviews.
No, you can't because it is a GBA Rom. You can play it on the computer using a emulator. A good GBA emulator is the VisualBoyAdvance.
You can download them from this link : http://www.emulator-zone.com/ They have all kinds of good emulators for most consoles!
PCSX2 is one of the few that is accepted as actually working
...the question seems to be worded wrong, but I think I understand what you meen. The Emulator-Zone is a good place for your one-stop emulator needs(not roms!).
There is no emulator for the Xbox.
emulator-zone.com
You can find many great websites that have downloads of many emulators (including the DS) and they usually update them so you don't have to worry about getting the wrong, old model. The emulator-zone is a good place for your emulator needs.