User blog comment:PokeLinkEs/Mabef?/@comment-3574097-20130322145653

Sometimes when you get people in streetpass if they have Spotpass or DLC characters in their team you will get a randomly generated character instead. You will get the randomly generated Avatars once in a while without getting anyone in streetpass. This is very likely where Mabef came from. She could also be someone elses Avatar.