- Edited
It's not about covering lands it's about luck and timing you can find zubats and pigeys in one place and then find a Jinx in the same place at another time. Only like 4 pokemons are region locked (the taurus, the kangaroo... sorry for not saying the names I am not a pokemon addict) but I think that the probability of finding certain pokemons is climate/region dependent unless you're lucky as I said before.