I would be skeptical on getting some of those "so called" legit Pokemon on the GTS. Just as you said you used an AR, it's just as simple for one to use an AR and post it up on the GTS for trade. Why do you think Nintendo attaches a "Ribbon" to the Event pokemon. That Ribbon looks nice, but it also stops it from being posted on the GTS. I'm not saying yours aren't real, but most of the time it's too good to be true.The other rare ones I first got with AR, but that was only to get them in the pokédex so I could trade for real ones in the GTS.