List of Pokémon forms by release date/2021

January
Shiny Snivy released on Unova Celebration event. Shiny (3) = PS Snivy (495) PS Servine (496) PS Serperior (497)

February
Shiny Spearow, Paras, Hitmonlee, Hitmonchan, Ditto, Snorlax and Mew released until Pokémon GO Tour: Kanto.

Please note that some of them might be released before the said event. Shiny (9) = PS Spearow PS Fearow PS Paras PS Parasect PS Hitmonlee PS Hitmonchan PS Ditto PS Snorlax PS Mew