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By virtue of the regional linearity of the game's storyline wherein regions are traveled to in generational succession, it is the fourth region that players venture into.
It is inhabited predominantly by Generation IV Pokémon, being the native land of them. While a smattering of post-generational Pokémon are interspersed throughout the wild, Generation V Pokémon and onwards, as well as Pokémon from previous generations, will be mostly unacquirable.
After completing the Sinnoh (quest), you will be teleported to your Grandma's house in Sinnoh.