The Up-Grade is used to evolve a Porygon into Porygon2. In FireRed to get a Porygon, you must get 9999 coins at the Rocket Game corner and then exchange them for a Porygon. To get an Up-Grade, beat eight opponents in the Trainer Tower in Seven Island. At the roof-top, talk to the owner who will award you an Up-Grade. Also if you look in Rocket Hideout on island 5 you can find one.
if you give it to your porygon and trade it, it will evolve into a porygon-2.
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This item can be found in the game it can be used to evolve a Porygon to Porygon2 by trading it to someone.
In order to evolve Porygon into Porygon2, you must give it the Upgrade item and then trade it to another game.
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