Pokémon Sun and Moon/Version differences
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There are a number of differences between Pokemon Sun and Moon.
Time of day
Sun and Moon are set 12 hours apart, so Sun follows the system clock, whereas Moon in-game time is transposed 12 hours from the system clock. For instance, if it is 10AM on the system time, the in-game time in Sun will be 10AM, but in Moon it is 10PM.
Totem of Melemele Island
Sun has Gumshoos: Moon has Alolan Rattata.
Version-exclusive Pokemon
Sun: Passimian, Lycanroc (Midday Form), UB-02 Expansion, Solgaleo.
Moon: Oranguru, Lycanroc (Midnight Form), UB-02 Beauty, Lunala.