Bakugan: Defenders of the Core

You can either get this trophy against a vacant second controller or the CPU. Make sure that you put the CPU on "Easy" and set the battle time to 300 seconds. Also make sure you have a Combo ability card and put the enemy's health at 50%. You get 1 point for each hit and 20 points for a kill. So you want lots of combos (such as from the ability card) and kills (from a weak enemy). In the closing seconds of the battle, kills are worth double. You should be able to get over 250 points in 300 seconds.