Palkia is a Legendary Pokémon, and while it appears in the game, it's not tied to a specific event like some other Legendary Pokémon. You can encounter Palkia in the following ways:
* Post-game: After completing the main story, you can find Palkia in the Distortion World, a special area accessible after defeating the game's main villain.
* Special missions: Occasionally, Palkia might be featured in special missions that can be accessed through the "Wish" function. These missions are usually limited-time events.
Therefore, there's no specific "Palkia event" in the game. It's more about encountering Palkia through regular gameplay or special missions.