User blog:Rmkane/Pokémon Originally Discovered in the Sinnoh Region are here!

Trainers,

The world of Pokémon GO is evolving once again! This week, keep an eye out for Pokémon originally discovered in the Sinnoh region, featured in Pokémon Diamond, Pokémon Pearl, and Pokémon Platinum! Get ready to see Pokémon like Turtwig, Chimchar, and Piplup as they appear in Pokémon GO for the first time ever.

Pokémon originally discovered in the Sinnoh region will be making their way to Pokémon GO in waves! So, you can look forward to discovering even more Pokémon over the next few weeks appearing in the wild, hatching from Eggs, and battling in raids. Stay tuned to our official channels for updates about new Pokémon, new features, and expansions to existing features like Pokémon storage and more!

More discoveries from the Sinnoh region await, Trainers, so let’s get ready to GO!

—The Pokémon GO team



First phase
The following twenty-six Pokémon were released on October, 2018.

Second phase
The following six Pokémon were released on October, 2018, with the start of Halloween event. It includes temporal Legendary Raid Boss – Giratina.

Third phase
The following three Pokémon were released on November, 2018.

Fourth phase
There were 11 Pokémon, being evolved forms of Pokémon from other regions, introduced to the game on November, 2018.

Fifth phase
There following 14 Pokémon were introduced to the game on December, 2018 during the start of the Holiday event.

Sixth phase
The following 15 Pokémon were released on January, 2019.

Swinub Community Day release
Despite the fact that Mamoswine was featured in announcement banner of Pokémon release from sixth phase it has not been released with the others and is likely to be released on February, 2019 Community Day.

Upcoming release
Similarly to Mamoswine, despite the fact that Mime Jr. and Happiny were also featured in announcement banner of Pokémon release from sixth phase it has not been released with the others.There have been speculations in player community that these two Pokémon might be released for the supposed Valentine's Day event.

Future phase
There following 27 Pokémon have yet to be released.