How I can get Aorara Pass & Mstery Pass in Pokemon leafgreen GBA in computer?

Answer 1

In computer? Is it a Rom? The third and final pass, the mystic ticket, can only be obtained through a nitenido event or by going to the Pokemon Center in New York.

But for the Auroa and Mystery pass you'll need to get the Ruby and Sapphire plates:

http://www.serebii.net/red_green/mystery-island.shtml -just look on the right hand column and click on the island you're on.