First, go to Rustboro City, then...go where you would go to get the wingull back from the old guy...but the patches of grass by the first bug catcher you see when trying to walk there is where you catch them...very low level and also sort of rare...don't go to the patches where the youngster is...the patches of grass below him.
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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 cannot be found in Pokemon FireRed. You have to trade them from a copy of Ruby, Sapphire, or Emerald.
nincada evolves at level 20 in Ruby/Sapphire it also evolves into shedinja so you better leave space in your team
You have to evolve Nincada. You can't catch it.
You can find nincada in the grass spots between the rustbarto tunnel and rustborto city