Complete the game as normal, then complete it in EX mode one or more times. Keep the same armor used when the game was completed the first time. Use all the extra bonus points to strengthen your weapon and armor, then go to the Chrysler building and use tools to strengthen new weapons. This is done by examining at the starting specs of the weapons. Example: An attack of 30+1, range of 20+2, and bullets of 40+0; refer to the first numbers. Use tools to move the parameters, and remember to do the same with your armor. Get all of the rare trading cards out of the Chrysler building and give them to Wayne to get the tool kit and super tool kit to upgrade your weapons as much as possible. Also remember to have a lot of room in the inventory for the final battle with Eve.