How many movies have Kappei Yamaguchi and Ryota Yamasato acted in together?

They have worked on 2 movies together! Their first movie together was Shuriken Sentai Ninninger vs. ToQger the Movie: Ninjas in Wonderland (2016) while their highest rated movie together was One Piece: Stampede (2019). They have not worked together since One Piece: Stampede (2019).