Nintendo Hong Kong has confirmed that it will host a distribution event for special Shiny Tapu Koko in Hong Kong and Taiwan. Pokémon Sun and Moon players who visit participating stores and prove that they own a Chinese or Japanese version of either game, or purchase a new version, you’ll get a serial code that offers a special Shiny Tapu Koko between April 28 and May 31. In addition to this, various Korean news sites have reported that Mew is being distributed at the Pokémon World Championships Qualifiers on May 5 through May 7. Pokémon Korea recently confirmed the distribution of Mew, the first with the Gen 7 native black clover. It’s Level 5 and knows the move Pound.
Source: Serebii