The Law of Ueki

Ueki and friends are ready to start the team tournament stage. They make way to Heaven where they meet four other teams of gifted whom they are meant to battle. God makes an appearance to tell the teams the rules for this stage of the tournament and with his usual penchant for eccentricities, starts off with a treasure hunting battle by sending the two teams to their destination via a heavenly pachinko method. Ueki's Team is going to be up against the Guruno Team. Right from the start, Ueki is up against Gitar, a music loving guy in a full black suit. Ueki attacks him with everything he has, but Gitar just shakes off the attacks, claiming to be invulnerable. How will Ueki be able to defeat someone he can't even hurt?