He completed his final Grandmaster norm at the 2000 Chess Olympiad in Istanbul and was officially awarded the Grandmaster title in 2001. Pelletier won the Swiss Chess Championship 6 times, in 1995, 2000, 2002, 2010, 2014 and 2017. He has also won numerous titles at the Swiss Team Championship with his first club Biel, and later the SG Zurich.