In an alternate dimension of the main universe Alola , Guzzlord brings about the destruction in the alternate Alola to a dystopia, not even Ultra Guardians’ counterpart, Ultra Rangers were unable to defeat its might. Many civilians can be either survived from it or be killed by it, with the survivors can be either manage to escape the now dystopian region, or trying find safer shelters upon being unable to escape the region from that Guzzlord. This leaves one of the survivors who are still stuck in the dystopian Alola are under the protection of Dia and his Zeraora, leading the survivors to find safer shelters.
When a universe displaced Ash Ketchum and Ash's Pikachu were transported to the alternate dimension and manage to convince Dia and his Zeraora to work together to defeat Guzzlord, Shiny Tapu Koko appeared before them, reawakening their Electrium Z-Crystals to perform Double Gigavolt Havoc on Guzzlord, finally sending the monstrous Ultra Beast to the Ultra Space, ending its reign of terror in the alternate Alola.
A Guzzlord of the main universe found a way to invade Alola of the said universe at Manalo Conference, which is a bad timing for the Alola Pokémon League annual award celebration. The Guzzlord then brought its two shiny counterpart partners in crime along with it. Thankfully, they were all quickly defeated by the united force of Z-Heroes (the Kahunas, Ash and his friends, Masked Royal/Professor Kukui, including Ash’s returning Poipole, now Naganadel), with the regular Guzzlord being defeated by the Kahunas. Thus preventing the tragic history repeated from what happened in alternate Alola.