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Have you caught Aerodactyl? I live in a busy city with an incredible variety of biomes. I spend a lot of time hunting, and picking up eggs ( I use incubators). I have hatched tons of 10k eggs, multiple Lapras, multiple Chansey, multiple Kabuto.. but no Aerodactyl.
I have continued to believe for a long time that egg results are very influenced by local biomes at the pokestop you get them at.
Where have you found Aerodactyl, what sorts of pokemon also inhabit the area? I go and search downtown too, and still nothing.
Aerodactyl is the only non-legendary non-regional pokemon that I am missing in my pokedex.
EDIT: Love the feedback! you guys rock! It seems that Clefairy Biomes and mountain biomes are an overwhelming favorite so far, for places near where it is found. Please think if this applies to your situation as well, as more information is always great!
EDIT 2: More evidence may be anecdotal, especially if it's a nest, as opposed to a biome, but if it is a biome (has been there through multiple migrations)... what sorts of characteristics are in these Clefairy/Dragonite/Aero biomes? Is it near water? far from water? does it vary? Low elevation? Rural? Urban? I'd imagine that too much detail on these biomes could delve into some information that is dubious, but for such a rare pokemon, I think it's worth the extra pontificating. Thanks again guys!!!!!
EDIT 3: For those that believe that nearby names of areas could possibly influence the biomes of the nearby pokemon, I did see someone mention they saw two at airports. The idea of "Aero"dactyl spawning near an airport is something that -- especially if it's not near a clefairy biome, could go a long way in solving a possible long thought theory that local areas and landmarks can influence biomes. I'll be checking the Jacksonville International Airport, and probably Orlando and Tampa at some point in the near future.