The Pokemon Company announced inside the English version of the Pokémon Duel app on Friday that the app will end service on October 30 at 9:59 p.m. EDT. The app has already ended sales of paid items including Gems.
The official website for the Japanese version of the app (titled Pokémon Comaster) also announced on Friday that the app will end service in Japan on October 31 at 10:59 a.m. JST.
The Pokemon Company describes the app:
Build your party of Pokémon figures and play against your friends in Pokémon Duel, free to download for iPhone, iPad, and Android devices! In Pokémon Duel, your objective is to deploy your Pokémon figures on the game board and move them to the goal in your opponent's territory. To win the game, you have to reach your goal before your opponent reaches theirs!
The app originally launched in Japan on April 12, 2016, and then launched in English on January 24, 2017.