Helix
no but you can get a dome fossil or helix fossil the dome fossil is kabuto and the helix is omyante
Omanyte evolves at level 40.
The Dome Fossil can be revived into the pokemon kabuto.
You Cant
Fossils cannot be created in Pokemon FireRed, there is a finite number of them to find.
The Left One
If taken to cinnbar island's research lab you can revive the Pokemon inside the fossil which will be Kabuto.
At cinnabar island at the pokemon lab third door.
Take it to the museum in cinnabar city to have it revived
cinnabar island research center
The ocean one in the museum.
Yeah you can. You can ask a friend who has one of the Kanto Games to trade a Pokemon holding the fossil and you can regenerate it, breed another Pokemon of the fossil it regenerates, then trade back!