How many movies have Etsuhito Mori and Kunihiko Yuyama collaborated on?

They have worked on 8 movies together! Their first movie together was Pokémon: The First Movie (1998) while their highest rated movie together was Pokémon: Arceus and the Jewel of Life (2009). They have not worked together since Pokémon the Movie: Volcanion and the Mechanical Marvel (2016). They are most known for their animation films together.