On the evening of October 22, 2019, Niantic seemed to have several minor slip-ups related to the Colossal Discovery event announced last week.
See the links below for the details on the events.
As reported on Reddit by u/ztirk, Regirock appeared in a raid next to an already spawned Darkrai raid. The user's account is tagged as located in Malaysia.
Shiny Skarmory was also reported at about 12 AM CDT, according to Redditor u/kyrunter3. Also, Eggs were suddenly reduced to 50% of their walk distance, according to GamePress contributor @InstantAirGael.
Skarmory Shiny is live or in testing mode hmm from r/TheSilphRoad
Half distance eggs happening now for some reason! #pokemongo pic.twitter.com/AtVO3LjAgS
— TForgery (@InstantAirGael) October 23, 2019
These strange spawns were stopped after about an hour of being active, with no confirmation of it from Niantic themselves. You can find the link below to our Impactful Mistake Timeline to see the other details on when spawns and legendaries didn't behave the way we expect.