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Omastar's are not available in the wild to be caught, or their pre-evolutions the Omanyte.
To get an Omanyte in either Pokemon Fire Red or Leaf Green (also in Yellow, Red and Blue) you need to choose the Helix Fossil in Mount Moon. Later in the game when you get to Cinnabar Island, you can take it to a laboratory there. The scientist will revive your Omanyte for you and it will evolve at level 40.