Go to Celadon City, and go into one of the big buildings. In one of them, there should be a women with a lot of Pokemon with her, talk to her, and she should give you the drink.
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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
Go to Celadon City, and go into one of the big buildings. In one of them, there should be a women with a lot of Pokemon with her, talk to her, and she should give you the drink.
You cannot get it in Pokemon FireRed. It doesn't matter because it is not necessary in Pokemon FireRed.