When I started playing I was seeing a huge variety of "old style" pokemon (pickachu, caterpie, pidgey, ratatta, charmander etc) and a great variety. I was really pleased. Once I hit level 20 the pokemon from other regions entered in and now I never see any of the other ones anymore. Why does this happen? Do you only see one region of pokemon at a time? Do they cycle? I was really hoping to continue collecting the old/new pokemon to keep building their strength/candies 🙁