I was just wandering around a new area I got to, as you can when you've defeated the Pokemon league, and I went into a place called the dream yard, which looked like a run-down practically destroyed house thing, and a Latias was flying around. I followed it around and I caught it. But why did this happen?
Does this happen in all gen V games? Is it Latias or Latios randomly or does it depend which version you play?