Question: Which Harry Potter film was #2 when Kamen Rider Decade: All Riders vs. Dai-Shocker opened at the #1 spot?

Related documents: [0]  [DOC] Kamen Rider Decade the Movie: All Riders vs. Dai-Shocker (劇場版 仮面ライダーディケイド オールライダー対大ショッカー , Gekijōban Kamen Raidā Dikeido Ōru Raidā Tai Daishokkā , "Masked Rider Decade the Movie: All Riders vs. Dai-Shocker") is the superhero film adaptation of the 2009 Kamen Rider Series "Kamen Rider Decade". The film was released in Japanese theaters on August 8, 2009, alongside the "Samurai Sentai Shinkenger" film, "". In its first week in theaters, it opened at the #1 spot, edging out "Harry Potter" (#2) and "" (#3), earning over 2 billion yen (approx. US$21M) in box office revenues. It is the highest grossing Kamen Rider film to date. [END] 
[1]  [DOC] Harry Potter and the Half-Blood Prince is a 2009 British-American fantasy film directed by David Yates and distributed by Warner Bros. Pictures. It is based on the novel of the same name by J. K. Rowling. The film, which is the sixth instalment in the "Harry Potter" film series, was written by Steve Kloves and produced by David Heyman and David Barron. The story follows Harry Potter's sixth year at Hogwarts as he receives a mysterious textbook, falls in love, and attempts to retrieve a memory that holds the key to Lord Voldemort's downfall. [END]  
Answer: Harry Potter and the Half-Blood Prince
Harry Potter and the Half-Blood Prince