The PP Catalog is used to unlock things by spending PP. PP can be earned though to Story, Duel Colosseum, and even Multiplayer. Even losing a battle in one of these modes still results in gaining PP. PP can be used to unlock: * Characters * Alternative Costumes * Voice Clips * Arenas to Fight in (for Multiplayer) * Level Caps for CPU (again for Multiplayer) * Bonus Boosts for the Calendar * Icons to be used for Multiplayer Avatars * Background music