You can have Nincada hold the Exp Share item and then you can go to the Pokemon League to challenge the Elite 4 and Champion in order to try and beat them.
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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.
level him up to level 55
the easiest way to level up your Pokemon to put it in daycare Pokemon will level up soon.Trade the Pokemon to friend and have it hold a lucky egg it will level up quickly.
the easiest way for me is to give it exp.share and face the elite 4
The easiest way to level up is to feed Pokemon Rare candies.