Go to the celadon dept store and buy a poke doll(on the 4th floor) then go to saffron city and go to the house left of the fighting dojo now in here give the little girl the poke doll and she will teach mimic to any of your Pokemon in your party.
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If used in battle it will help you escape a wild pokemon, also if given to a certain person in saffron city you will be able to teach the move Mimic to any pokemon.
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.