The first-ever Evolution Eleganza event was recently announced for Pokémon GO. Read on below for all the details:
Evolution Event Look forward to Evolution items from raids, longer-lasting Lure Modules, and increased encounters with Pokémon that evolve in special ways.
Date + Time
From Thursday, December 5, 2019, at 1:00 p.m. to Thursday, December 12, 2019, at 1:00 p.m. PST (GMT −8)
Features
- Pokémon that evolve in unique ways—such as Onix, Eevee, Roselia, and Burmy—will be appearing more often in the wild, in raids, and in Field Research.
- Take on raids against Pokémon with unique Evolutions, like Lickitung, Scyther, Togetic, and Ralts!
- Find more 2 km Eggs that will hatch into Pokémon such as Tyrogue, Feebas, Burmy, and Happiny.
- Event-specific Field Research tasks that reward Evolution items, which can help you evolve certain Pokémon, will be available.
- If you’re lucky, you may encounter a Shiny Burmy! This means you’ll also have a chance to get Shiny Wormadam and Shiny Mothim for the first time.
Bonuses
- All Lure Modules will last one hour for the duration of the event, including the Glacial, Magnetic, and Mossy Lure Modules.
- 2× XP when evolving Pokémon
- Evolution items from raids
Evolution Event Raid Day
Date + Time
- Saturday, December 7, 2019, from 11:00 a.m. to 2:00 p.m. in your local time zone
Features
- Encounter Bulbasaur, Charmander, and Squirtle in one-star raids.
- Encounter Ivysaur, Charmeleon, and Wartortle in two-star raids.
- Encounter Venusaur, Charizard, and Blastoise in four-star raids.
- You may encounter the Shiny counterparts of any or all the aforementioned Pokémon.
- Receive up to five additional Raid Passes during the Raid Day time period when you spin a Photo Disc at a Gym. These Raid Passes will not be available after the event period is over. You cannot hold more than one Raid Pass at once.
- A new Event Box is now available for purchase via the in-game shop. It includes six Premium Raid Passes, one Star Piece, one Super Incubator and one Lucky Egg for 480 PokéCoins.
Source: Official Pokémon GO blog
Pokémon Blog 
3 thoughts on “You can now encounter Shiny Bulbasaur, Shiny Charmander, Shiny Squirtle, Shiny Ivysaur, Shiny Charmeleon, Shiny Wartortle, Shiny Venusaur, Shiny Charizard and Shiny Blastoise as part of the Pokémon GO Evolution Event Raid Day”