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It even looked worse than X and Y in some aspects, like the simpler clouds and shadows. They also made the paths squarish instead of rounded/realistic like Kalos's to try to be "faithful" to the original games.
The squarish tile-like cliff design really showed its age here. Doesn't help that they do sometimes use a better, realistic style for cliffs, but it's plopped next to the tiled ones making everything look jarring.