https://www.mercurynews.com/2019/12/13/pokemon-go-where-to-spend-decembers-epic-community-day-in-the-bay-area/

As expected, Niantic is wrapping up the year with an epic two-day Community Day extravaganza.

The team is bringing back every Community Day pocket monster going back to 2018. This gives lapsed or newcomers a chance to catch up and grab important Pokemon that they must have missed. The following creatures and their shiny forms will be available from 9 a.m. to 9 p.m. Dec. 14 and 15: Beldum, Larvitar, Bulbasaur, Charmander, Dratini, Eevee, Chikorita, Squirtle, Cyndaquil, Pikachu, Mareep, Bagon, Treecko, Torchic, Mudkip, Swinub, Ralts, Turtwig, Totodile, Chimchar, Trapinch and Slakoth.