The official Pokémon movie website has updated. Translations follow:

The Real Dasshutsu Game/Pokémon the Movie 20 crossover "Escape From Houou's Trial" Will Be Held in 8 Cities All Across Japan for a Limited Time!

The Real Dasshutsu Game "Escape From Houou's Trial", which commemorates the premiere of "Pocket Monsters the Movie: I Choose You!", will be held in 8 cities all across Japan starting in July 2017!
"Escape From Houou's Trial" is a personal experience-type game event set in permanent Real Dasshutsu Game establishments and the cities they are located in, where you solve riddles scattered throughout the city one after another, together with Pokémon.

You go choose your first Partner Pokémon from "Fushigidane", "Zenigame" and "Hitokage" and set off on a journey as a rookie Pokémon Trainer as well!
You can also choose between two different courses that vary in difficulty, the "Professor Course" and the "Trainer Course", so both adults and children can enjoy this game!



©Nintendo/Creatures/GAME FREAK/TV Tokyo/ShoPro/JR Kikaku
©Pokémon
©2017 Pikachu Project

Ticket prices:
Normal pre-order ticket: 2500 yen/Student pre-order ticket (high school+): 2000 yen/Child pre-order ticket (Grade school to middle school): 1250 yen
Normal same-day ticket: 3000 yen/Student same-day ticket (high school+): 2500 yen/Child same-day ticket (Grade school to middle school): 1750 yen



Schedule:
*Hokkaido
Friday August 4th to Tuesday October 31th, 2017
*Miyagi
Wednesday July 26th to Tuesday October 31th, 2017
*Tokyo
Thursday July 13th to Tuesday October 31th, 2017
*Kanagawa
Wednesday July 19th to Tuesday October 31th, 2017
*Aichi
Friday July 21st to Tuesday October 31th, 2017
*Osaka
Thursday August 3rd to Tuesday October 31th, 2017
*Okayama
Thursday July 20th to Tuesday October 31th, 2017
*Fukuoka
Friday August 4th to Tuesday October 31th, 2017

Organizing and production: SCRAP
In cooperation with: Pikachu Project

For details, see the official site

Source: http://www.pokemon-movie.jp/news/?p=2702