Klutz prevents the use of Fling. From the Battle Subway: CPU Goruug uses Fling targeting my Gengar. Fling failed. I tried it out myself to make sure: Gobitt has Kultz and is holidng a Cheri Berry. Gobitt uses Fling targeting a wild Gobitt. Fling failed. I always figured Flinging Iron Balls was half the reason behind the existance of Klutz. Now you can't even do that.