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So I've wondertraded like 8 boxes worth of 4IV things including:
Riolu with Crunch, Bullet Punch, and Vacuum Wave
Brave Honedge
Adamant Houndour with Pursuit and Sucker Punch
Timid Houndour
Adamant Ralts
Adamant+Immunity/Jolly+Sandveil Gligar Adamant Feraligatr with Ice punch+DD+Crunch
Solar Power Helioptile
Adamant Leavanny
Drought Vulpix
The following are the most popular that I've received and things that can be caught before reaching Lumiose City
Basically, Wonder Trade is cancer and kids are getting really lucky with "good" pokemon but don't know that they're holding gold