it doesn't actually do anything- it's a secret base item ornament.
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Its a prize given by beating the battle tower lots of times.
Not that i know of i believe it is only in gold and silver
Only Gold, Silver, Crystal, Ruby, Sapphire, and Emerald have night and day.
by either trading with Pokemon heart gold or Pokemon soul silver, or you can migrate from ruby, emerald, and/ or Sapphire
Blue, Red, Green, Yellow, Gold, Silver, Crystal, Leaf Green, Fire Red, Sapphire, Ruby, Emerald, Diamond, Pearl, Platinum, Heart Gold, Soul Silver, Black, White, Black 2 and White 2, X, Y, Omega Ruby, Alpha Sapphire.