That item doesn't exist in firered.
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In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
the sea incense is found somewere in cerulean cave(which is in kanto)
To get Pokemon firered on PC download a vba and Pokemon firered ROM
Yes there are shiny Pokemon in firered
it will let you breed munchlax's without the full incence you will get snorlax