on cinnibar island
Give the fossil to the guy, walk out, and immediately walk back in. It's instantaneous.
no
The island of Hoenn is not available in Pokemon LeafGreen, unfortunately. FireRed and LeafGreen are limited to the region of Kanto, while Ruby, Sapphire, and Emerald are currently the only Pokemon games that take place in Hoenn.
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.
Myths maybe an ancient reasoning of the world, likened to modern science.
Take it to the Science Lab in Cinnabar Town. Give it to the very weird scientist at the end of the hall. Leave the room, then come back.
A lot of Science Fiction takes place in the future. It can take place whenever the author wants it to.
In the Scopes Trial!
you can take any fossils you find to a nerd boy by himself in the Pewter City Museum
We'll find out when they happen.
True! Usually to be science fiction it has to take place in the future or has to be based on space travel or have some evidence of advanced technology!
You can take the fossils to the museum in Oreburgh City. There you can take them to the guy behind the desk and he delivers you the Pokémon from the fossil.