That item does not exist in firered.
It depends which kind. You can find them anywhere!
snorlax givs munchlax
You put rock insence on a sudowoodo and you breed it.
You can find one on Route 38.
Yes I think so
Mt. Pyre in Ruby/Sapphire/EmeraldLost Cave in FireRed/LeafGreenRoute 204 in Diamond/Pearl/Platinum
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
There is no Pokemon convention in firered.
To get Pokemon firered on PC download a vba and Pokemon firered ROM
Yes there are shiny Pokemon in firered
You give it to your Pokemon and if you battle a trainer, you get double the prize money, like a luck insence
You cannot get it in Pokemon FireRed. It doesn't matter because it is not necessary in Pokemon FireRed.