you can not get nincada in leaf green as it was a 3rd generation pkmn.So you might as well just give up looking for one
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Nincada is a Ground and Bug type pokemon.
Nincada cannot be found in Pokemon FireRed. You have to trade them from a copy of Ruby, Sapphire, or Emerald.
to catch a nincada you need to use a pokeradar in eterna forest. the cances of catching a nincada are mostly in the shiny patches.
nincada
Nincada evolves into Ninjask at level 20. If you have an empty slot in your party and an extra pokeball (a normal pokeball) Nincada will also evolve into Shedinja (It evolves into two Pokemon at once)