General Chat - Weird New Pokemon Sighting

After community day ended today, I encountered this thing everywhere! I’ve never seen it before and at first, I thought it was an Unown. It had a name of ??? and a CP of ???. Every time I captured it, it turned into a Ditto. I have a few questions about it: Does anyone know if this thing has a name? Does it turn into Ditto every time you catch it? Was it merely a glitch in the game?

Any answers are much appreciated.

Thank you!