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Team Aqua scheme #16: Rain on Orre until the ground is full and hope something happens. Trying to see if you can get any more detail out of Mt. Battle itself by increasing the texture size (this one is 3200 x 3200, tiled from a 1600 x 1600 the original was 512 x 512), and naturally there isn't much you can do with it.
Regarding the excess mipmaps in battle scenes, I wonder if turning off the excess mipmap setting would reduce that. Otherwise I'd imagine you can ignore all but the two or three largest.