Tundra

It seems strange that a tundra can be find in the Orange Islands, but it's because this rests miles under the mountains. The tundra seems like it would in complete darkness, but a giant crystal rises from the cave floor to the top. It casts rainbow colors around the cavern, creating a breath-taking and awe-inspiring effect. The Pokemon down here have adapted to life in interesting ways, mostly changing their colors to dappled black, white and opalescent.