Dome Fossil = Kabuto (Lv 40, evolves to Kabutops)
Helix Fossil = Omanyte (Lv 40, evolves to Omastar)
Old Amber = Aerodactyl
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Fossils cannot be created in Pokemon FireRed, there is a finite number of them to find.
only if you trade with a friend
You can't, you have to trade over from FireRed or LeafGreen.
Aerodactyl is revived from one of the fossils that you receive in Mt. Moon.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.