How many movies have Peyo and Yvan Delporte collaborated on?

They have worked on 12 movies together! Their first movie together was The Smurfs and the Magic Flute (1976) while their highest rated movie together was Les Schtroumpfs - Coffret spécial anniversaire 50 ans (2008). They have not worked together since Les Schtroumpfs : Les Schtroumpfs en classe verte (2013). They are most known for their animation films together.