Man, I start Pokemon rumours all the time. take it from me, this one is straight up whack. never happened to me or anyone else I knew.
if it did happen and you tried to catch it, it would more likely jam your game than let it happen. someone with a pc is just yankin' ya.
and if it is an AR glitch then that still means nothing, as it couldn't happen without AR and you have to willingly input a code to essentially mess with your own file.