Generation III broke from the continuous storyline that had been established between Generation I and Generation II, opting instead to move players to the Hoenn region, an island region disconnected from Kanto and Johto. The games themselves are incompatible with the previous two generations as well

Details in the Hoenn- and Kanto-based games hint that the storyline of Ruby, Sapphire, and Emerald is contemporaneous with that of FireRed and LeafGreen (and due to this, contemporaneous with Generation I as well), placing Generation III three years before Generation II and Generation IV, themselves contemporaneous.