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If you want some perspective regarding level design, locations I'd suggest you to look at from older games include Seafoam Islands, Ice Path, Shoal Cave, the Abandoned Ship, the Distortion World and B2W2's Victory road. These are (admittedly by Pokémon standards) well-crafted dungeons with some good puzzles and depth. Even the routes in Alola feel very small and insubstantial, paling in comparison to routes like Johto 45, Hoenn 120 or Unova 18.
