By finishing third at the 2015 World Championships, Mottet had secured a qualification spot for Belgium at the RioOlympics. However, with this spot not being nominative, the Belgian Shooting Federation had to choose which candidate they thought the best to represent the country there. The final choice was between Mottet and Yannick Peeters (son of former Belgian Olympic shooter Frans Peeters, and Mottet was chosen in June 2016.
At the Rio Olympics, he ended 10th. After the first day of qualifications, he was placed 16th of the 33 competitors. He climbed 6 positions on the second day, ending with 116 points. Only the first 6 shooters qualified for the semi-finals; the 6th scored 118 points in the qualifications.