Sinnoh is a region featured in the fourth generation of Pokémon games_Pokedex). Generation IV follows from Generation III, although it is unlike Generation II in that it is not a direct sequel. Like previous generations, Generation IV focuses on one main region across three games, the Sinnoh region featured in Pokémon Diamond, Pearl, and Platinum on the Nintendo DS, released in 2006 and 2008 (and 2007 and 2009 outside Japan) . The Sinnoh region is the territory where most of the fourth generation games took place. It is the oldest region in the world and is said to be where all Pokémon originated from.