go into the house in cinnabar island in the bottom left corner go to the third place and one of the people will ask you what fossils you have and then you pick whatever one you have and then he says that it will "take a while". In the other pokemon games like pearl you can just go out of the building, and then just go back in and it'll be ready, i don't know if that works for me because I didn't try it in this game. I hope this helped!
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You can't you have to trade.
cyndiquil
Erika, and she uses bug and leaf type so bring a flying or fire type pokemon with you
To breed Pokemon from Poekmon Fire Red to Pokemon Diamond you must put Pokemon Fire Red into the DS slot, turn the game on, select Pokemon diamond, press start and then in stead of pressing your file, scroll down until you see migrate from Pokemon Fire Red. This will bring you to your Pokemon Fire Red PC box and you can choose six Pokemon to migrate. After that you must go to Pal Park on Route 221 and catch those migrated Pokemon there. Don't worry, even if they're legendary, you catch them in one try. - BEWARE - POKEMON MIGRATED TO DIAMOND CANNOT BE MIGRATED BACK
It will not come back.