How many movies have Shotaro Ishinomori and Tatsuji Yamazaki collaborated on?

They have worked on 2 movies together! Their first movie together was Super Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship (2009) while their highest rated movie together was Kamen Rider × Kamen Rider W & Decade: Movie War 2010 (2009). They have not worked together since Kamen Rider × Kamen Rider W & Decade: Movie War 2010 (2009).