How many movies have Kazuhiko Yabumoto and Takehito Koyasu collaborated on?

They have worked on 3 movies together! Their first movie together was Sergeant Keroro The Super Duper Movie 4: Crushing Invasion, Dragon Warriors (2009) while their highest rated movie together was Code Geass: Akito the Exiled 2: The Wyvern Divided (2013). They have not worked together since Code Geass: Akito the Exiled 2: The Wyvern Divided (2013). They are most known for their animation films together.