Pokémon Diamond and Pearl Gen 4 dataminers find that Pokémon encounter rates change on special days, holidays, tragic days

Dataminers have learned many hidden details about Pokémon Diamond and Pearl since the source code of the games recently leaked. Previously, they discovered an event featuring Cyrus, the games’ primary villain, which did not appear in the final game. In addition, @shinyhunter_map on Twitter has found that encounter rates for wild Pokémon change on certain days of the year, especially holidays.

To celebrate special holidays, Diamond and Pearl give a 5% boost to the encounter rates for all Pokémon. This bonus applies to prominent holidays like St. Patrick’s Day, Independence Day, and Christmas Eve. In addition, the list includes many other holidays celebrated outside of the United States.

Conversely, some days result in a 10% decrease to the spawn rate of wild monsters. This effect occurs on the anniversaries of various tragic events. Such tragedies include 9/11 and the bombings of Hiroshima and Nagasaki during World War II. Interestingly, encounter rates also decrease by 5% on Christmas, New Year’s Eve, and New Year’s Day.

More about Gen 4’s varying Pokémon encounter rates

The varying Pokémon encounter rates have everything to do with Diamond and Pearl’s Pokétch, according to Kaitlyn “Orcastraw” Molinas. The Pokétch is an in-game app that keeps track of real-world time. Some of its already-known in-game effects include turning snow into diamonds and creating rain at the Valor Lakefront depending on the day of the year. However, Orcastraw noted that date-based changes to spawn rates do not appear in later Pokémon games.

Interestingly, the date can change more than just encounter rates in Pokémon Diamond and Pearl. On certain days, Pokémon eggs will hatch 10% quicker than they would under normal circumstances. This effect is most notably present on Pokémon developer Junichi Masuda’s birthday.

What are your thoughts on how real-world time can change in-game experiences in Pokémon Diamond and Pearl? Do you think these features should have carried over to later generations? Let us know in the comments or on our social media!


Dylan Tate
Dylan Tate is a student in the Hussman School of Journalism and Media at the University of North Carolina at Chapel Hill. He is a gaming journalist with a love for Nintendo esports, including Smash Bros., Splatoon, ARMS, and Pokémon. Dylan also writes esports news articles for Daily Esports.


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