To get Ninjask and Shedinja, you have to have destroyed the falling star, got the Friend Area Secretive Forest and a Nincada(Can be recruited in Lapis Cave). Best if you got it and made it LV100.Then go to Luminous Cave and evolve it into a Ninjask with a Moon Stone if you have a Moon Stone.Then go to the Friend Area of Ninjask and you'll the Shedinja.If the Nincada that became a Ninjask was a LV100(Train it),then both Pokemon will have the same attacks and HP(Maximum HP:127).