For the last few days, I've been seeing a considerable number of wild Lairon. I don't recall ever seeing a wild Lairon before - only Aron - but over the last few days I must have seen dozens.
I don't particularly mind, as I have an Aggron with near-perfect IVs that could use the Candy. But why are so many of them appearing all of a sudden? I can only assume this is part of an event, but the only one I know of that's happening right now is the Evolution Event, and Lairon doesn't have any special evolutionary requirements, so it's not that.