Read on below to learn more about Pokémon Sleep: Event: Entei Research The Legendary Pokémon Entei appears! Increased volcanic activity has been reported around a part of Greengrass Isle! Follow-up research in the area around the volcano revealed bits of Entei Mane that Entei left behind. According to Professor Neroli, he’ll be able to conduct … Continue reading Full details revealed for the Pokémon Sleep Entei Research event, which will run from May 20 at 4 a.m. to June 3 at 3:59 a.m. local time