How many movies have Hiromi Kato and Ken Ootsuka collaborated on?

They have worked on 2 movies together! Their first movie together was Digimon Adventure 02: Hurricane Touchdown! The Golden Digimentals (2000) while their highest rated movie together was One Piece: Baron Omatsuri and the Secret Island (2005). They have not worked together since One Piece: Baron Omatsuri and the Secret Island (2005).