i would say the dome fossil coz kabutos is cooler thn the other 1
There are three fossils total: the Helix Fossil which becomes Omanyte, the Dome Fossil which becomes Kabutops, and the Old Amber which becomes Aerodactyl. You can obtain the Old Amber from the Pewter Museum once you can use Cut outside battle, but you are offered a choice between the other two fossils near the end of Mt. Moon; whichever one you do not pick, you will not be able to obtain during that gameplay.
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The Dome Fossil can be revived into the pokemon kabuto.
Fossils cannot be created in Pokemon FireRed, there is a finite number of them to find.
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.