Fossils cannot be created in Pokemon FireRed, there is a finite number of them to find.
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The Dome Fossil can be revived into the pokemon kabuto.
The Left One
At cinnabar island at the pokemon lab third door.
Go to Mt. Moon and go until you fight this scientist person and then you will be able to get the dome fossil.
The old amber is the fossil of aerodactel go to cinnibar island to ressurect him/her