Link to the Reddit thread.
What do you guys make of this? A lot of people are saying it's Japanese hackers/modders.
According to /vp/, this is an unused PSS Icon supposedly only used in certain cases. However hackers from Japan have unlocked it among other things. It could be someone from Japan experimenting with the PSS Icon and name changing.
It is evident that there are hackers from Japan because they have their own version of PokeGen for XY called Cyber Gadget, which costs money, but could allow them to create hacked Pokemon with maximum stats (999 in everything for example). Since the Passerby Battles don't have a hack check unlike the Battle Spot, players with the Cyber Gadget program can potentially use these hacked Pokemon in battles.