You can find out the results on the official Pokemon World Champship 2011 Website. Here's the article that reveals the winners and their decks (scroll down through the page to see the junior and senior winning results).
Also, in case you are wondering what Yanmega deck Gustavo Wada won with, it was Yanmega/Magnezone/Kingdra, and Kohei Takenaka played Reshiram/Typholosion.