To get the other form of Nincada (which is Shedinja) you need 5 spaces in your party including Nincada and at least one Pokeball. Then you need to get Nincada to level 20. It will then evolve into a Shedinja. In the space that was empty, you also get a Ninjask.
AnswerFirst you must catch a Nincada at any level under 20. Then while you are training you must keep at least one space left with no Pokemon in your party, and you must also have a Pokeball or any kind of Pokeball. Finally, train your Nincada to level 20 which is when it evolves into a Ninjask. The empty space you left blank would then be a Shedinja inside one of your remaining Pokeballs in the bag.
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Ninjask by far because of its speed
You evolve a ninjask with room in your party pretty simple really
Ninjask is a Bug and Flying type Pokemon that evolves from Nincada at level 20. In the third generation it learns new moves at levels 20, 25, 31, 38, and 45.
I don't really know some other rare Pokemon but I do know how to get shedninja in Pokemon emerald. First, you have to find a nincada that has a bold nature and evolve it into ninjask. Right after it evolves, look in your party and you might have a shedninja that says you met it at the same level in the same area at the same level caught with the same kind of pokeball, the same ID number as ninjask, and even the same move set as ninjask. What I think is really weird about shedninja is he only has 1hp and it never gets more hp as you level it up. Hope this helps.
If you level it up to level 45 you will be able to let it learn dig, but remember you'll have to delete a move to learn it.