A new distribution event has been announced for Pokémon Sun and Moon players in Japan. This event consists of the annual Tanabata Festival event at the Pokémon Center in Tohoku, where Jirachi is being distributed for a limited time. It will be distributed to Pokémon Sun and Moon from August 6 through August 13, 2017. No further details have been revealed for this event yet, but stay tuned for any updates.
Source: Serebii