How many movies have Kazumi Sato and Tsutomu Nishiyama collaborated on?

They have worked on 4 movies together! Their first movie together was Initial D: Third Stage (2001) while their highest rated movie together was Yo-kai Watch: The Movie (2014). They have not worked together since Pokémon the Movie: Volcanion and the Mechanical Marvel (2016). They are most known for their animation films together.

Pokémon the Movie: Volcanion and the Mechanical Marvel (2016)

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Supervising Animation Director
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Key Animation

Yo-kai Watch: The Movie (2014)

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Key Animation
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Key Animation

Pokémon the Movie: Diancie and the Cocoon of Destruction (2014)

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Supervising Animation Director
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Key Animation
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Key Animation

Initial D: Third Stage (2001)

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Supervising Animation Director
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Key Animation
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Character Designer