From Bulbanews, your community Pokémon newspaper.
Serial code for Shaymin included
||This local article reports on an event in a specific geographical location. It may not be relevant for all readers.
Update: The publisher states that the book will be released on July 15, 2015, 2 days earlier than the official Korean Pokémon website states. Additionally, it also states that the codes can be redeemed until January 31, 2016. The serial code can only be redeemed in Pokémon Omega Ruby and Alpha Sapphire.
An official guidebook for Pokémon Omega Ruby and Alpha Sapphire will be published on July 17th, 2015 in South Korea. A serial code for Shaymin will be available with the book.
Further details are yet to be announced.