6th Gen 3D Overworld.

Well I don't think a cave counts as a overworld but I noticed the end of glistering? cave has the 3d effect. Actually all of it does.

Most non-overworlds, non-hoarde encounters, and non-buildings are in 3D.

They made the game 2D because with all the detail, the game would lag horribly if played normally.

I see all kinds of people nitpicking over this, but who the Hel cares though? Most people turn the 3d off anyway to avoid eye iratation. Frankly more detail (and evidently better fps) is better than the gimmick that is 3D, to me