Making his senior Grand Prix (GP) debut, Ponsero placed fifth in October 2005 at Skate America. He was seventh at his second GP assignment, the 2005 NHK Trophy. In March 2006, he ranked second in his qualifying group, first in the short, and seventh in the free at the World Junior Championships in Ljubljana, Slovenia; he was awarded the bronze medal behind Japan's Takahiko Kozuka and Russia's Sergei Voronov.