Date-Based Events

Date-based events are in-game events triggered only on specific dates. Unlike Mystery Gifts, these events are specifically triggered by time checks within the game's script. They can occur each year within their specified date range unless they're either set to run on specific years or removed from the game in a future update.

October

First witnessed in versions 2.1, 2.2, and 2.2.1, Pokémon Sardonyx contains a few minor changes lasting through the entire month of October.

• Pokémon encountered in the wild have a 10% chance of becoming one of several Ghost-type Pokémon in the event that they would otherwise not be Ghost-type. The only exception to this is the starter Pokémon caught by the player.
• Phantump and Pumpkaboo can be found lurking in Peridot Forest. Each map contains one of the two. After an encounter, they will disappear and respawn after a week. This allows for a maximum of 5 encounters with each map for a total of 20 throughout the month.
• Specific sand castles in Citrivale Docks, Amaris City, and Ironis City will be revealed to be Sandygast. After an encounter, they will disappear and respawn after a week. This allows for a maximum of 5 encounters with each map for a total of 15 throughout the month.
• The power of Ghost- and Dark-type moves are increased by 30%
• Margot's outfit changes to a dress and hat based on Mismagius during the month.