The official Pokémon movie website has updated. Translations follow:

Railway Stamp Rallys Start All Across Japan!

This summer, stamp rallys are being held at railways all across Japan! Visit lots of stations and collect Pokémon stamps!

1: The JR West Pokémon Summer Vacation Stamp Rally 2016



The annual, super popular Pokémon stamp rally is being held again this year!
It starts up in conjunction with the movie "Pokémon the movie XY&Z: Volcanion and the Ingenious Magearna", which premieres Saturday July 16th!
This time around it involves two areas, the Kansai area and the Hokuriku area! Visit lots of stations where stamps are set up and enjoy the world of Pokémon!!



*Period: Saturday July 16th to Sunday September 4th 2016
*Area: Participating JR West Stations (Kansai area/Hokuriku area)
For more information, see this JR-odekake.net page

2: The Pokémon Stamp Rally Along the Meitetsu Railroad 2016



Pokémon that play a major role in the movie, like "Volcanion" and "Magearna", appear as stamps!
Those of you who manage to collect all the stamps will be given a cool gold "original coin"!
Aim for completing the collection!
While the stamp rally is going on, a "Pokémon Train" with Pokémon from the movie drawn on it is scheduled to be running as well!



*Period: Saturday July 16th to Wednesday August 31st 2016
*Area: Alongside the Nagoya Railroad
For more information, see the Pokémon Stamp Rally Along the Meitetsu Railroad 2016 page

3: Miyoshino Presents the Sapporo Municipal Subway Pokémon Stamp Rally 2016



Pokémon that play a major role in the movie, like "Volcanion" and "Magearna", appear during this year's stamp rally! If you collect two stamps and bring them to the Pokémon Center Sapporo, you'll be given an original notebook!
And once you've been to all the stations, you get to try the lottery machine at the Pokémon Center Sapporo!



*Period: Saturday July 16th to Wednesday August 31st 2016
*Area: Around Sapporo, Hokkaido
For more information, see the Sapporo Municipal Subway Pokémon Stamp Rally 2016 page

Source: http://www.pokemon-movie.jp/news/?p=2256