As per the latest news post on the Pokemon GO website, Palkia and Dialga's Origin Formes have been confirmed as additions to the game and will be available to obtain as soon as February 2023. These special additions are key to the Pokemon GO Tour: Sinnoh live event, taking place in Los Angeles, United States, and will be obtainable to players throughout the duration of this event. However, the special forms of these Legendary Pokemon won't be sticking around permanently, meaning players have a tight window to secure one of these specimens.