Shedinja
~ admin, May 26th, 2009
To get Shedinja, you must first catch a Nincada, and have an empty space in your party. People say you need a Pokeball for it, but you do NOT. Shedinja copies the ball the Nincada was caught in.
Anyways, with one empty space in your party, level up Nincada to level 20. It will evolve into Ninjask. When you check your party, you will see Shedinja sitting in the final slot, along with the Ninjask and 4 other Pokemon.
That is how to catch Shedinja.