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The Nature Preserve is located far away from the Unova region. Therefore, it is not located on the map, it does not have an entry in the Habitat List, and the player cannot Fly out of the area.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
Trivia
The Nature Preserve is the location of both the highest and lowest leveled wild Pokémon in any Pokémon game—Magikarp and Gyarados. The level 1 Magikarp and Gyarados are tied with the Snowpoint Temple's Regigigas in Platinum and the Resort Area's level 1 Magikarp for lowest leveled wild Pokémon; the level 100 Magikarp and Gyarados are tied with the Resort Area's level 100 Magikarp for the highest leveled wild Pokémon.