On September 22, the Nintendo 3DS Virtual Console titles Pokémon Gold Version and Pokémon Silver Version will be released worldwide on Nintendo eShop. Fans who purchase either of the games will receive a special code that will grant them the Mythical Pokémon Celebi in the Pokémon Sun, Pokémon Moon, Pokémon Ultra Sun or Pokémon Ultra Moon video games. Special themes featuring Ho-Oh or Lugia for each game will also be available for fans who purchase Pokémon Gold Version or Pokémon Silver Version by January 15, 2018.
Pokémon Blog 
so how do you get the theme lol
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Just purchase either game before the end of the year 😀 https://pokemonblog.com/2017/09/14/pokemon-gold-and-silver-official-theme-descriptions-and-offer-details-for-nintendo-3ds/
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