Legendre joined the Senior National Team in 2009 where he was chosen to compete in the 2009 World Artistic Gymnastics Championships in London, England. He made the floor final where he placed 8th. The following year he traveled to Melbourne where he was part of the gold medal team in the Pacific Rim Championships, also winning the bronze medal for the floor exercise. Later he traveled to the 2010 World Artistic Gymnastics Championships in Rotterdam where he helped the team to a 4th-place finish in the team competition and again came 8th in the floor finals. In 2011 he was part of the bronze medal winning team at the 2011 World Artistic Gymnastics Championships. He again competed in the floor final, where he managed to improve on his previous rankings at past world competitions, finishing in 5th place behind bronze medalists Alexander Shatilov and Diego Hypólito. In 2013, he competed at the 2013 World Artistic Gymnastics Championships in Antwerp, Belgium. He tied with Hypolito for 5th place once again in the floor final and earned his first individual world medal, a silver on the vault behind Yang Hak Seon and ahead of Kristian Thomas.