Nincada cannot be found in Pokemon FireRed. You have to trade them from a copy of Ruby, Sapphire, or Emerald.
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You can find nincada in the grass spots between the rustbarto tunnel and rustborto city
eterna forest with pokeradar
Nincada is a Ground and Bug type pokemon.
You can only find a Nincada in Eterna Forest. Keep in mind, they're pretty hard to find! So good luck!
You cant find it in Firered only leafgreen.