You can only get the Helix Fossil in Pokemon HeartGold. This means that to get an Omanyte or Omastar in SoulSilver, you must either trade for one or trade for a Pokemon holding one.
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old amber, dome fossil and maybe some more
no you can trade soulsilver pokemon to black
In Kanto (requires 8 badges and beaten Pokemon champ once for access), in Pewter city there is a museum. go in and on the far right there is a scientist that will take all your fossils and turn them into Pokemon.
Dome Fossil = Kabuto (Lv 40, evolves to Kabutops) Helix Fossil = Omanyte (Lv 40, evolves to Omastar) Old Amber = Aerodactyl
You CANNOT LEGALLY download Pokemon Soulsilver.