Pokémon Ultra Sun and Ultra Moon
As with previous installments, the games follow the journey of a young Pokémon trainer, taking place in the Alola region — based on Hawaii. Differences from "Sun" and "Moon" include an alternate storyline and new gameplay features, characters, Pokémon, and Pokémon forms, including new forms of the legendary Pokémon Necrozma as version mascots. The games received generally positive reception, with critics praising the additional features included over "Sun" and "Moon", although some criticized it for being too similar for a majority of the story. By the end of 2018, "Ultra Sun" and "Ultra Moon" had  sold over eight million copies worldwide. Gameplay. Similar to previous games in the series, "Pokémon Ultra Sun" and "Ultra Moon" are role-playing video games with adventure elements. While set in an alternate version of the Alola region, the mechanics and graphics remain largely the same as "Pokémon Sun" and "Moon", with the primary differences being its modified storyline now including the Ultra Recon Squad. The player character designs are also different, though they remain customizable. "Global Missions", where players across the world work towards a collective goal, also make a return. New features. "Ultra Sun" and "Ultra Moon" introduce  new Ultra Beasts: Stakataka, Blacephalon, Poipole and its evolution, Naganadel. In addition, there are new forms for the legendary Pokémon Necrozma, dubbed "Dusk Mane" and "Dawn Wings" forms, which are achieved by absorbing the legendary Pokémon Solgaleo and Lunala, respectively; it is conceptually similar to Black and White Kyurem from "Black 2" and "White 2" and Lusamine's mutated form from the original "Sun" and "Moon". Also, a new Lycanroc form was added, Dusk Lycanroc. Players can now travel around the Alola region to collect Totem Stickers, which allow the player to receive a Totem-sized variant of a Pokémon . Three new activities have been added: Mantine Surf, which allows the player to surf across the region's seas—it also serves as an alternate way of earning Battle Points; Alola Photo Club, which allows players to take pictures of their player character with Pokémon in various poses; and Ultra Warp Ride, which allows the player to travel through varying Ultra Wormholes and encounter Ultra Beasts in their own worlds—in addition to finding legendary Pokémon from every game in the series, up to three times, and an increased chance for shiny Pokémon to appear. New Z-Moves are available  for multiple Pokémon, including Solgaleo, Lunala, Lycanroc, Mimikyu and Necrozma. An upgrade to the Rotom Pokédex adds Roto-Loto, which allows the player to use boosts, akin to O-Powers from the previous generation; and Z-Rotom Power, which allows players to use up to two Z-Moves per battle. Plot. Setting. The games put an emphasis on the legendary Pokémon Necrozma which, in these versions, takes Lusamine's place as the primary antagonist of the games. As with "Sun" and "Moon", the games are set in the Alola region which is based on Hawaii. Although largely the same, the  new games feature additional buildings and locations in comparison to the first installments. Multiple main characters featured in "Sun" and "Moon", such as Lusamine and her children, return in the game with significant changes. A new group, the Ultra Recon Squad, is introduced with differing characters in the two games. Ultra Megalopolis, a vast city where Necrozma has robbed all of its light sources, is located within Ultra Space and is accessible through the Ultra Wormholes. Another antagonist group, Team Rainbow Rocket, is featured in a post-game story and includes all of the previous antagonist group leaders featured throughout  the series, ranging from Giovanni from "Pokémon Red", "Blue" and "Yellow" to Lysandre from "Pokémon X" and "Y". Legendary Pokémon from previous generations are also included. Story. Similar to "Sun" and "Moon", the player character is an eleven-year-old moving to Melemele Island in Alola with their mother. As is tradition, the player has rivals on their journey: Hau, a friendly boy who accompanies the player throughout the story, and Gladion, the estranged son of Lusamine. During their travels in Alola following the region's traditional island challenges, they complete trials which involve battles with powerful Pokémon known as  Totem Pokémon, and encounter numerous groups — a villainous one known as Team Skull, led by a man named Guzma; a more charitable one known as the Aether Foundation, led by a woman named Lusamine; and another called the Ultra Recon Squad, who came from a different dimension, the Ultra Megalopolis, where Necrozma has stolen its light. Much of the story revolves around multiple legendary Pokémon: a Cosmog, nicknamed Nebby, who eventually evolves into a Solgaleo in "Ultra Sun", or Lunala in "Ultra Moon"; and Necrozma, who attempts to seize the light from Alola. During the climax, Lusamine uses Nebby to  create a wormhole to the Ultra Megalopolis, where she and Guzma attempt to fight Necrozma for the sake of the Ultra Recon Squad. However, they fail and are thrown back into their dimension later on in the story, with Necrozma following them. Necrozma fights Nebby, now a Solgaleo or Lunala, and prevails. Necrozma then absorbs the legendary Pokémon, gaining its Dusk Mane or Dawn Wings form in the respective version, and unleashes the Ultra Beasts upon Alola before fighting the player. After the player defeats it, Necrozma escapes into the Ultra Megalopolis, taking the world's light with it while  the player, with the help of the Ultra Recon Squad, travels on the opposite legendary featured in each game—Lunala in "Ultra Sun" or Solgaleo in "Ultra Moon"—through Ultra Space to reach the Ultra Megalopolis. There, the player battles Necrozma, this time in its true form, as Ultra Necrozma, for the fate of the world and to rescue Nebby. The player defeats it once more, bringing light back to Alola. After completing these trials, the player proceeds to battle a newly established Elite Four and later defeats Hau to become Alola's first true Pokémon League Champion. In the post -game, the player encounters Team Rainbow Rocket, a dimensionally displaced group based on Team Rocket from "Red", "Blue", and "Yellow". The aforementioned group seizes control of the Aether Foundation's headquarters and takes Lusamine hostage. The player stages a counterattack alongside a reformed Guzma, Lillie, and former Team Plasma leader Colress. Battling through villainous team leaders from the past games—Maxie and Archie from "Ruby", "Sapphire", and "Emerald"; Cyrus from "Diamond", "Pearl", and "Platinum", Lysandre from "X" and "Y", and Ghetsis from "Black", "White", "Black 2", and "White 2"—the player finally encounters Giovanni, who leads Team Rainbow Rocket and has  a Mewtwo at his disposal. After the player's victory, Giovanni vanishes, wondering "what new world shall [he] unleash [his] evil schemes upon". The player can then explore the Ultra Wormholes, the worlds of the Ultra Beasts, and catch them with the Beast Balls they have acquired. After catching Necrozma at Mount Lanakila, Colress will appear and give the player the N-Solarizer or N-Lunarizer, allowing Necrozma to fuse or separate from Solgaleo or Lunala respectively. Once the player has caught the Ultra Beasts, the Ultra Recon Squad will tell them to defeat or catch Stakataka in "Ultra Moon  or Blacephalon in Ultra Sun". Development. Shigeru Ohmori, one of the game's producers, stated that "Ultra Sun" and "Ultra Moon" were worked on by younger staff members while veterans worked on the upcoming "Pokémon" games for the Nintendo Switch, although some more experienced members, such as Shigeki Morimoto were assigned to it. He also stated that Game Freak was treating "Ultra Sun" and "Ultra Moon" as the "culmination of our work with the 3DS system". The development team of 80 was approximately half that of "Pokémon Sun" and "Moon" despite "Ultra Sun" and "Ultra Moon" having a script twice  as long as "Sun" and "Moon". In a separate interview, Ohmori also described an idea to develop the "Ultra" installments formed late during the development of "Sun" and "Moon", with the titles intended to take advantage of the momentum gained by the "Pokémon" series following the massively successful release of the mobile game "Pokémon Go". Game director Kazumasa Iwao was previously in charge of the battle systems in "Sun" and "Moon". In the post-game, the games include a tribute to former Nintendo CEO Satoru Iwata, mentioning his role in the development of "Pokémon Gold" and "Silver". The games received  their first patch in December 2017, fixing several bugs. Promotion and release. "Ultra Sun" and "Ultra Moon" were revealed in a Pokémon Direct on 6 June 2017. Initial clerical errors in the "Pokémon" website showed that the games' release date for the Nintendo Switch were "TBA", although The Pokémon Company later clarified that the games were exclusive to the Nintendo 3DS. Similar to its predecessor, the game's files were leaked on to the Internet before their official release, allowing software pirates to play the full game and data miners to find previously unannounced information including a new form for  Necrozma, a new Ultra Beast, a new mythical Pokémon and more. Less than a week before the game's release, the mobile game "Pokémon Go" released an update which enabled its players to customize their in-game avatars in the style of player characters from "Ultra Sun" and "Ultra Moon", marking the first time the app had been used to promote a main series game. Reception. Prior to release, both games were among the most highly anticipated titles for the Nintendo 3DS in 2017, according to Nielsen. Critical reception. "Ultra Sun" and "Ultra Moon" received "generally favorable" reviews according to  review aggregator Metacritic. Casey Defreitas in her review for "IGN" remarked that the games were "full of smart improvements". Other reviewers made similar points, with Kallie Plagge at "GameSpot" noting that despite similarities with "Sun" and "Moon", ""Ultra Sun" and "Ultra Moon" make enough changes to stand apart as the definitive version of the seventh generation games". On the other hand, Allegra Frank of "Polygon" criticized that the aforementioned changes were only present at the end, with the bulk of the gameplay being the same as its predecessor. Sales. Following release, the two games sold 1.2 million physical copies—excluding  digital copies purchased from the Nintendo eShop—within the first three days on sale in Japan. By the end of the year, the two games had sold over 2 million copies in Japan alone, making it the best-selling video game in the country for 2017. Sales from "Ultra Sun" and "Ultra Moon" pushed the cumulative sales of the franchise to exceed the 300 million copies sold milestone. According to Amazon, "Ultra Sun" and "Ultra Moon" were their seventh-best selling video games in 2017—however, they drop to 25th for "Ultra Sun" and 28th for "Ultra Moon" if other  video game-related products and console variations are accounted for. , the games have sold 9.04 million copies, ranking them as the ninth–best selling Nintendo 3DS titles of all time. Awards. The games were nominated for "People's Choice" at the Italian Video Game Awards, and won the "Excellence Prize" at the Famitsu Awards.