All Weapons/Items:
Goto the Character Selection screen and push the analog stick to the RIGHT three times. Now push the stick to the left and select Lupus. Start the game and during gameplay enter the following:
C-Right, C-Right, C-Right, C-Left, C-Right, C-Right, C-Up, C-Up, C-Up
A barking sound will be heard if done correctly. Use the A and B buttons to choose and drop the items/weapons.