Only one part of Island 2 has not been left completely to natural growth, and that is Fort Bragg, the main base of the Republic of Seafoam Army's boot camp. The rest of the island is left completely undeveloped.
The terrain of Island 2 varies from thick forests, to white sandy beaches, to open fields littered with destroyed vehicles taken from the various battlegrounds of the Dark Pokemon Wars and the League Wars.
The sole purpose of Island 2 is for training exercises of the Seafoam military, and as boot camp for the Army. Civilian access to the island is restricted.
