Pocket Monsters Movie 12 - Arceus - Towards the Continuum of Conquest (アルセウス超克の時空へ) ranked #2 in the Japanese box office for its debut weekend of July 18th and 19th. Harry Potter and the Half-Blood Prince, which also was released this week, was the overall winner in Japan.
Source:
http://movie.goo.ne.jp/ranking/boxoffice/index.html