Nincada evolves into Ninjask at level 20. However, Nincada will evolve into a Shedinja, if you have an empty slot in your party and a regular Poke Ball in your bag. If you want just Ninjask, you must need six Pokemon in your party.
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level 20 (ninjask)
nincada evolves at level 20 (i think) if you have an empty pokeball when you evolve nincada you will get a shedninja. nincada evolves into ninjask
Ninjask cannot evolve any further. If you are meaning Nincada, it can evolve into Ninjask at level 20, but it can also evolve into Shedinja, if you have an empty party slot and a Pokeball with you.
ninjask doesn't evolve but if you have a empty slot of your Pokemon team when nincada evolves to ninjask a shedinja will appear in the empty slot.
Nincada evolves into Ninjask at level 20 while Nincada evolves into Shedinja when you level it up while you have space in your party and your belt.