they follow the journey of a young Pokémon trainer as they train Pokémon, taking place in the Alola region—based on Hawaii—with the object of the game being to thwart the schemes of Team Skull, and later the Aether Foundation, all while attempting to challenge various Pokémon trainers of gradually increasing difficulty. Sun and Moon introduced 81 new Pokémon species, and new features such as Alolan forms of previous generation Pokémon, powerful moves known as Z-Moves, powerful creatures known as Ultra Beasts, updated battle and training mechanics, and improved polygonal 3D graphics. While largely independent of one another, the two games follow a similar plot, and while either can be played separately, trading Pokémon between the two games is allowed and necessary to complete the Pokédex, just like in previous installments.