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, rising up 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
Paldea-region Pokédex introduced 2 new Pokémon species and distinct forms (Gimmighoul and Gholdengo). 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 was released at the start of Spring into Spring 2023.

Regular (2) =

April
Regieleki was released.

Regular (1) =

April
Shiny Tapu Bulu was released.

Shiny (1) = PS Tapu Bulu

April
Bounsweet and Shiny Drilbur were released at the start of Sustainability Week 2023.

Regular (3) =

Shiny (2) = PS Drilbur PS Excadrill

April
Shiny Stunfisk was released at the start of the Stunfisk Limited Research.

Shiny (1) = PS Stunfisk

May
Larvesta, Shiny Mantyke and Shiny Shock Drive Genesect were released at the start of An Instinctive Hero. Unova Platinum medal became achievable for the first time. All Unova-region Pokémon species were released, becoming the fourth region to be possible to complete the Pokédex.

Regular (2) =

Shiny (2) = PS Mantyke PS Genesect

May
Kleavor was released at the start of the Kleavor Raid Day.

Regular (1) =

Shiny (1) = PS Kleavor

May
Shiny Tapu Fini was released.

Shiny (1) = PS Tapu Fini

May
Mega Pinsir was released at the start of A Valorous Hero.

Regular (1) =

Shiny (1) = PS Pinsir

May
Shiny Fennekin was released at the start of May 2023 Community Day.

Shiny (3) = PS Fennekin PS Braixen PS Delphox

June
Sandygast and Shiny Clauncher were released at the start of Water Festival: Beach Week.

Regular (2) =

Shiny (2) = PS Clauncher PS Clawitzer

June
Shiny Nihilego was released.

Shiny (1) = PS Nihilego

June
Shiny Fomantis was released at the start of Solstice Horizons.

Shiny (2) = PS Fomantis PS Lurantis

June
Carbink and Shiny Pancham were released at the start of Solstice Horizons - Team GO Rocket takeover.

Regular (1) =

Shiny (2) = PS Pancham PS Pangoro

June
Mega Sableye will be released at the start of Dark Flames. Mega Evolution Guru Gold medal will become achievable for the first time. Regular (1) =

Shiny (1) = PS Sableye

July
Mega Tyranitar will be released. Regular (1) =

Shiny (1) = PS Tyranitar

August
Mega Rayquaza, Frost Rotom, Diancie, and shiny Unown M and !, Petilil, and Dewpider will be released at the start of Pokémon GO Fest 2023: Osaka. Regular (3) =

Shiny (7) = PS Unown PS Unown PS Rayquaza PS Petilil PS Lilligant PS Dewpider PS Araquanid

August
Shiny Golett and Skrelp will be released at the start of Pokémon GO Fest 2023: New York City. Shiny (4) = PS Golett PS Golurk PS Skrelp PS Dragalge

August
Shiny West and East Sea Shellos, Joltik, Goomy, and Oranguru will be released at the start of Pokémon GO Fest 2023: Global. Shiny (10) = PS Shellos PS Shellos PS Gastrodon PS Gastrodon PS Joltik PS Galvantula PS Goomy PS Sliggoo PS Goodra PS Oranguru