Johto

Johto is the second Pokemon region. It is the first to introduce new Pokemon since the series first released. The Johto region consists of the discovery of 2 Pokemon types, Steel type and Dark type, as well as a few other discoveries such such as those that consist of different evolutions, such as Pikachu being evolved from Pichu and the like.

The region was also to be discovered to sit right next to the Kanto region. Because of that, both regions share the same Pokemon League. So far, these 2 regions are the only ones to have done this as other regions went on to have their own Pokemon Leagues.