This event was distributed to a few lucky residents of the United Kingdom and the Republic of Ireland,
distributed during an event that celebrates the launch of Pokemon Sun & Moon.
As the DVs (Gen I IVs) are distributed with 15 in every slot,
it is not possible to obtain this as a Shiny when transferred normally through Pokemon Transporter.
This PK1 file will not be compatible with JPN version of the game.
THIS MEW IS LEGAL FOR VIRTUAL CONSOLE,
AND CAN BE TRANSFERRED UP TO GEN 7 AND ONWARDS.
This is a video of @RupeeClock's collection of the hyper rare Mew!
(Also, it can be seen that the Event Staff's unit has a Restore Point function!)