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I usually send pokemon not part of the normal Kalos dex like last night I sent some Larvestas... got Breloom, Weedle, Scatterbug, Flabebe, Noibat, Gabite, Pancham, Rhyhorn, Illumise, Torchic, Pikachu, Ralts, Swirlix, Azurill and... A Zygarde with a Dragon Claw and a Japanese Ditto.
Honestly I just like anonymous trades and seeing where all the people come from.