Pokémon Sleep’s ‘Pursue Mewtwo’ event runs September 14–28
Serebii says the “Unexplored Realm Research! Pursue Mewtwo” event ends September 28 at 3:59 a.m. local time.
TLDR
Serebii reported on September 14, 2026, that Pokémon Sleep’s “Unexplored Realm Research! Pursue Mewtwo” event was live. The outlet lists the event window as September 14 at 4 a.m. through September 28 at 3:59 a.m., all in local time.
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