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I have nothing against brown skinned characters, and in my hack I have a few.
That said, Gen2's artstyle requires a white highlight that typically doesn't work well with any tone shader than tan (Like the hiker and swimmer class trainers)
Plus it typically uses two weak colors and two highlight colors. But certain tones of the skin, by virtue of all backgrounds being white, will become a strong color, especially if you are using a rich brown instead of a low saturation tone closer to grey.
Its much easier to do it in Gen3's style. But Gen2 style is pastel and you have to deal with such issues.