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I don't know what's going on lately, but my town has seen a spike in pokemon that were pretty uncommon before.
Vulpix, Sandshrew, Ponyta, and Geodude are suddenly everywhere, and suddenly Zubat, Meowth, and Ekans numbers have dwindled when they were frustratingly high before.
I know that nests apparantly change, but is it possible that a town's most common pokemon can rotate from time to time?