Fair point. I'll make a map when I have the spare time, possibly tomorrow or Tuesday. In the meantime, use these:

Popla Forest, known to be rich in berries and apples, and also the namesake of the village built near it, contains:
Budew, Bidoof, Ratatta, Sunkern, Wurmple, Pidgey, and Raticate (rare).

Crag Cave, known for rocky terrain and Pokemon, contains:
Geodude, Tyrogue, Aron, Roggenrola, Woobat, Zubat, and Munna (rare).

Mount Mist, known for its consistently misty summit, contains:
Geodude, Pidove, Machop, Dwebble, Tyrunt (rare), and Axew (rare).

I'll make a more detailed, more involved, and more globe-spanning map later, and post it here when I'm done.