What makes it even worse is all the people on Miiverse who are not allowed to share Friend Codes and trade directly. It's easy for anyone and everyone, you and me included, to hijack a trade. Or to trade a hacked Pokémon and make the other trader upset when (s)he finds out it's hacked.
I saw someone on Miiverse state he was trading a 6IV Shiny Latias he received himself in a trade. I said right away that it's a hack, as just encountering one would have a 1 in 879 TRILLION chance. I later convinced him to connect with me via a GTS trade, but the Latias wouldn't go over the GTS. He set up a Fletchling for Fletchling trade. This at first got hijacked as someone beat me to it, so he set up another. This time we connected, and I sent his Fletchling back to take a look at the Latias.
The trader did a good job disguising it, in fact. It was encountered in Johto, no doubt as either the wandering Latias or the Event Latias that was limited-time. However, it was clear that the Latias could not be anything but a hack as, while it COULD be Shiny, just the perfect IVs were unlikely. Further, he caught it in a Fast Ball, which has a low catch rate on Latias. It even had Ribbons; one for Hall of Fame, the other some Ribbon I don't remember hearing of before. You might have thought it was legit...until you looked up the Trainer's OT on Youtube. He has a video about trying to hack a Hoopa, and a history of hacked Pokémon.
I claimed the Leftovers from the Latias and got back in touch on Miiverse to send the scammed trader two Enigma Berries, which I finished growing that evening. I said plant them, water them, and keep growing them because you won't find their trees. After insisting I didn't have to, I said no, you got scammed and I'm a generous guy. He did accept them.
