Sinnoh is a region in universe of Pokémon and is the setting of Pokémon: Diamond & Pearl series.
Sinnoh, like Pokémon regions, features a broad range of environments to explore. The region is mountainous and temperate, and features, for the first time in a region to have a snowy snowy routes. While this region's location with relation to other regions portrayed in the franchise is unknown, Ash Ketchum refers to Sinnoh as an island during of the last episode of season 9, while Professor Oak mentions that it's located to the north of the Kanto/Johto landmass. The map shows that the region consists of about 70% land and 30% water. There are thirty routes in Sinnoh numbered 201 to 230 and, like the Hoenn region before it, do not follow sequentially from the previous region's routes: routes in Hoenn, the previous region, were numbered 101 to 134.
Sinnoh has four lakes, each of which houses a legendary Pokémon: Lake Acuity houses Uxie who shows itself to Brock, Lake Valor houses Azelf who shows itself to Ash Ketchum, Lake Verity houses Mesprit who shows itself to Dawn, and the secret Sendoff Spring houses Giratina inside Turnback Cave. Sinnoh is based on the geography of the Japanese island of Hokkaidō and the disputed island of Kunashir (Kunashiri).
May makes a re-entry for the Wallace Cup in Pokémon: DP Battle Dimension.
For the list of Sinnoh's Gym Leaders click here.
For the list of Sinnoh's Elite Four members click here.
For Sinnoh's Champion click here.
For the list of the Notable people that have visited Sinnoh click here.