Go to the safari zone and also go to different parts of grass and you will need alot of balls. Also catch the Pokemon in the safari zone and grass.
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You must beat the seven gym leaders, the elite four, and your rival. Then you have to capture 60 Pokemon to get your Rainbow pass the will allow you to travel to Island 7 in Pokemon FireRed.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
To get Pokemon firered on PC download a vba and Pokemon firered ROM
Yes there are shiny Pokemon in firered
You cannot get it in Pokemon FireRed. It doesn't matter because it is not necessary in Pokemon FireRed.