Every time a Shedinja spawns-- and it is often-- they come with an onslaught of Nincada. The nincada have become the most prevalent spawn in areas that have few to no Pokemon spawnable blocks. The nincada prefer solid blocks over slabs and will move into proper habitats, choking out any chance for normal Pokemon to spawn there.

Spawning for Shedinja has been tweaked. Shedinja's spawn rate itself hasn't been lowered, but a bug that made shedinja spawn at x2 levels in the air has been corrected. Nincada spawns have been lowered, and it is no longer guarenteed that airborn shedinja spawn with nincade.