The Pokémon found below are often impacted by the objects placed in the area. For example, Fearow will not appear in the Peak area unless there are five Forest objects placed in the Peak area. Spheal will not appear in the Peak area until the Peak Waterside objects have been upgraded, because it requires 35 Waterside objects, and each area can only contain 30 objects of each kind to start with. Also, Pokémon can need two types of objects. For example, Vigoroth needs Plains and Forest objects.
In all zones, there are 10 encounter slots which give to the Pokémon present a 10% chance to appear. All the Pokémon that appear due to blocks have a 10% chance to appear; however, some Pokémon can be in two slots, which gives them a 20% chance to appear.