i think 20
Yes, it evolves at 20. You MUST have an empty slot with you, though, to be able to evolve it.
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
Nincada evolves into Ninjask at Level 20.
nincada evolves at level 20
In Pokémon Sapphire, Nincada will evolve at Level 20.
lv 20
level 20 (ninjask)
level him up to level 55
Nincada evolves at level 20. If you have a free space in your party, you will also get a Shedinja.
20-ish
20
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.
Nincada evolves into Ninjask at level 20. Also, a Shedinja will appear in your party if there is an empty slot when the Nincada evolves.