Ready to build up your Fairy Type medal? We've got a new event focused on none other than the Generation 1 Pokemon Clefairy, and... that's about it.
On September 10 from 6:00 p.m. to 9:00 p.m. local time, clefairy will spawn en-masse. And that's literally all that we know right now. It's hinted that this event will bring new surprises along the way, but for now Clefairy spawns is all that we know for sure.