https://www.techradar.com/news/nintendo-teases-a-new-pokemon-may-be-introduced-in-lets-go-crossover-event

Nintendo's official Pokemon Twitter account heated up today with a surprise tweet pointing to a brand new creature, with hints of a possible crossover event planned between the Pokemon Go mobile AR game and upcoming Let's Go: Pikachu and Eevee entries for Nintendo Switch.

Rumors surfaced earlier this week of a new nut-shaped Pokemon appearing on player's Pokemon Go apps at a community event in Japan. The Pokemon was simply named '???', and would transform into a regular Ditto when captured.