Pokémon the Movie: Coco premiered in Japanese theaters on December 25th, 2020.
On May 13th, 2020, it was announced that the movie would be
postponed due to the COVID-19 pandemic.
For the weekend of December 26th and 27th, 2020, first place in that box office was
Demon Slayer: Kimetsu no Yaiba The Movie: Mugen Train, which is now
highest-grossing film ever in Japan. Pokémon the Movie: Coco placed second though making 276 million yen in the box office.
Source:
https://eiga.com/ranking/jp/ and
http://www.kogyotsushin.com/archives/topics/t8/202012/28162318.php