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My mega-medicham [JP] came from wondertrade at lv1, jolly x/31/31/31/31/31 with bullet punch, drain punch, psycho cutter and fakeout. I didn't even change anything, just EVed it, leveled it to 50 and stuck it in the battle box. I've gotten quite a few decent spitbacks, 4-5IV, but that's probably the nicest one.
Also had two safari shinies (grass monkey, electrode).
Friend of mine got a shiny timid noibat [JP] which I believe was 4iv when checked. We assumed someone was Masuda breeding and absolutely determined to get 100% flawless.
UK players are the absolute worst, not once have I had anything off a Britbong that wasn't from route 1 or the forest. Of the yuros, Germans seem to be slightly better than average. Americans are almost always sending shitmons en masse but sometimes you get a spitback. Japanese are most likely to be dumping spitbacks but also throw back trash they've received from Americans rather than just releasing it.