In Dead Rising 2 for the PS3, Xbox 360, and PC, there are two combo cards you will receive by defeating psychopaths. Here is a list of the combo cards you’ll receive and who you need to beat to get them.
Check out my other guide if you’re looking for the full list of combo card locations.
Flamethrower (Water Gun + Gas Can) – Defeat Slappy in the “Everyone Knows Slappy” mission on day 2 at 12pm.
Rocket Launcher (Lead Pipe + Rocket Fireworks) – Defeat Reed & Roger in the “World’s Most Dangerous Trick” mission on day 4 at 12am.