On one of the islands i forget which but there is a museum with a scientist that will revive it for you then leave and come straite back into the room and he says uve been gone forever! Then he gives it to you
The Dome Fossil can be revived into the pokemon kabuto.
You Cant
Helix
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!
give the fossil to the museim dude in peweter.(sorry about the bad spelling :)