List of Pokémon forms by release date/2023

January
Shiny Chespin was released at the start of January 2023 Community Day, while Kecleon was released immediately following Community Day. Hoenn Platinum medal became achievable for the first time. All Hoenn-region Pokémon species were released, becoming the third region to be possible to complete the Pokédex.

Regular (1) =

Shiny (3) = PS Chespin PS Quilladin PS Chesnaught

January
Mega Salamence and shiny Dedenne were released at the start of Twinkling Fantasy.

Regular (1) =

Shiny (2) = PS Salamence PS Dedenne

January
Shiny Tapu Koko was released.

Shiny (1) = PS Tapu Koko

January
Shiny Helioptile was released at the start of Crackling Voltage.

Shiny (2) = PS Helioptile PS Heliolisk

February
Mega Gardevoir, shiny Frillish, Heart Trim Furfrou, and Tapu Lele were released at the start of Valentine's Day 2023.

Regular (1) =

Shiny (5) = PS Gardevoir PS Frillish PS Jellicent PS Furfrou PS Tapu Lele

February
Primal Kyogre and Groudon were added to the game files, increasing Hoenn-region Mega & Primal Pokédex to 22 forms.

February
Primal Kyogre and Groudon, shiny Unown H, Surskit, Gulpin, Torkoal, Cacnea, Kecleon, Tropius, Relicanth, and Jirachi were released at the start of Pokémon GO Tour: Hoenn - Las Vegas. Since then, all Shiny forms of Hoenn-region Pokémon were released.

Regular (2) =

Shiny (14) = PS Unown PS Surskit PS Masquerain PS Gulpin PS Swalot PS Torkoal PS Cacnea PS Cacturne PS Kecleon PS Tropius PS Relicanth PS Kyogre PS Groudon PS Jirachi

February
Paldean forms were also added to the game files, raising Kanto-region Pokédex to 187 distinct forms and Johto-region Pokédex to 133 distinct forms. Also Paldea-region Pokédex introduced 105 new Pokémon species and 113 distinct forms. Roaming form Gimmighoul was released.

Regular (2) =

March
Hawlucha was released at the start of Season 10: Rising Heroes.

Regular (1) =

March
Mega Medicham and Bruxish were released at the start of Festival of Colors 2023.

Regular (2) =

Shiny (1) = PS Medicham

March
Regidrago was released.

Regular (1) =

March
Shiny Galarian Slowpoke was released at the start of March 2023 Community Day.

Shiny (3) = PS Slowpoke PS Slowbro PS Slowking

April
Cutiefly will be released at the start of Spring into Spring 2023. Regular (2) =

April
Regieleki will be released. Regular (1) =

April
Shiny Tapu Bulu will be released. Shiny (1) = PS Tapu Bulu