Ultra Wormholes are portals that appear above gyms in Pokemon Go and allow Ultra Beasts to travel into our world from a different dimension called Ultra Space. They are unstable portals that establish a connection from the Pokemon world to Ultra Space, and they were first introduced in the Sun and Moon titles of the Pokemon game franchise. Ultra Wormholes are heavily associated with Cosmog, a legendary Pokemon that is able to open them along with its final evolutions Solgaleo and Lunala. In Pokemon Go, players can find Ultra Wormholes above gyms when theyre active during special events. Instead of eggs appearing prior to a raid, an Ultra Wormhole will pop up in its place to indicate an Ultra Beast is going to emerge after the timer counts down. Ultra Beasts are incredibly powerful creatures that are just as powerful as Legendaries and could really shake up the Go Battle League meta. The Ultra Beast you can expect to appear will depend on the current event, and Ultra Beast raids typically only occur during an event.