Generation IV refers to the fourth generation of Pokémon games, which includes titles like Pokémon Diamond, Pearl, and Platinum. Released in the mid-2000s, this generation introduced new features such as online trading and battling through the Nintendo Wi-Fi Connection. It also expanded the Pokémon universe with 107 new species, bringing the total to 493. This generation is notable for its enhanced graphics and gameplay mechanics, including the introduction of Pokémon Contests and the Global Trade Station (GTS). The Sinnoh region, where these games take place, is inspired by the real-world Hokkaido region of Japan, offering diverse environments and challenges for players.