on cinnibar island
amber kauto and amdrie
You can't get any other fossils unless you buy FireRed or LeafGreen.
Go to the desert where you obtain the fossils
Fossils can be revived at the Museum in Pewter City.
You can't, you have to trade over from FireRed or LeafGreen.
You revive your Fossils in the Museum that is in Pewter City.
You give it to the scientist in the cinnibar island lab that asks for fossils.
On cinnabar Island, to the left of the pokemon center, lies a "laboratory". If you go inside, then go to the right and enter the third door. Talk to the Professor there.
at the lab on cinnabar island the third door talk to the guy in the white lab suit
The fossils in both Leaf Green and Fire Red are found inside of Mount Moon. You can only ever take one, however, as the scientist takes the other, so choose wisely.
Firered and leafgreen both can catch different Pokemon but there pokedex is the same, here is some examples: magmar only in leafgreen not firered, oddish in firered not leafgreen, ekans in firered not leafgreen, bellsprout in leafgreen not firered, pinsir in leafgreen not firered.