Trade it from LeafGreen.
Sandshrew must be given to you by leafgreen version.
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You can not catch Sandshrew in Pokemon Firered. It is Leafgreen exclusive. Firered gets Ekans instead.
i caught mine on the path from Cerulean city to Rock Tunnel
You have to get sandshrew in waywards cave but its also pretty rare to get him in there
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
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