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.

Valentine's Day release
With the beginning of Valentine's Day Happiny was released as it was previously speculated in player community.

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. It was released on February, 2019, a day prior to February Community Day that features Swinub.

Dialga release
Dialga was released as a Raid Boss available from March, 2019 until March , 2019.

Lake Guardians release
Lake Guardians were released with the beginning of May, 2019. These are first Legendary Pokémon to be released in the wild.

Upcoming release
Similarly to Mamoswine and Happiny, despite the fact that Mime Jr. was featured in announcement banner of Pokémon release from sixth phase it has not been released with the others. It is currently unknown when it will be released and how exactly will it be hatchable due to fact that it evolves into European region-exclusive Pokémon.

Future phase
There are following 26 Pokémon that have yet to be released.