The Solstice Horizons event was announced by Pokemon GO. It starts on June 16 at 10 am local time and finishes on June 25 at 10 pm local time. The Pokemon you can catch will change depending on the time of day. During the day, you can catch Drifloon, Leydba, and Purrloin. People can find Pokemon like Spinarak, Phantump, and Oddish at night. When the Legendary Pokemon Cosmog, which was first seen in Pokemon GO last year, shows up during free games, you will get a free Special Research prize.