Skylanders Spyros Adventure

In the boss fight, wait until Kaos sends out the Skylander that resembles Stump Smash. He spits out seeds in two attacks: one big one that goes straight in front of him and two small ones that split up and go to the left and right. Simply damage him until you are certain you can kill him in one hit (or two) and wait until there are at least 6 seeds circling the arena. Kill him and the trophy is yours.