Which Harry Potter film was #2 when Kamen Rider Decade: All Riders vs. Dai-Shocker opened at the #1 spot?
Kamen Rider Decade: All Riders vs. Dai-Shocker:  The film was released in Japanese theaters on August 8, 2009, alongside the "Samurai Sentai Shinkenger" film, "". Harry Potter and the Half-Blood Prince (film): Harry Potter and the Half-Blood Prince is a 2009 British-American fantasy film directed by David Yates and distributed by Warner Bros.
i don't know