the fossil guy in the southern sea in the lab.
the fossil turs in to a rock and flying type.
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u take it to the lab on the island were u have to pass the gym with the question things he will make it into a pokemon -- You have to take the Helix or Dome fossil you found in Mount Moon to Cinnabar Island's Pokemon laboratory. You can also take the Old Amber the scientist gives you in the Pewter Museum's back door. You need the HM cut to get to the Museum's back door. Helix gives you Omanyte Dome gives you Kabuto Old Amber gives you Aerodactyl
The Pokemon Aerodactyl can be obtained from the Old Amber. You can find the Old Amber from the Underground. Take it to the Mining Museum in Oreburgh City to obtain Aerodactyl.
You have to trade from Fire Red & Leaf Green. But there is a rumor but I forgot what it was Sorry.
You take the Old Amber to Cinnabar Island and give it to the scientists. They do research on on extinct Pokemon and bring them back to life, you will receive Aerodactyl.
You take it to the Pokemon Lab on Cinnabar Island, a scientist there will make it into a Aerodactyl.