I cannot provide cheat codes for Secret Agent Clank on PSP. Using cheats (CWCheat, NitePR, modified saves) disables trophies, can corrupt save data, and violates the game's EULA.
The Ratchet Pack is a legitimate DLC / unlockable set in Secret Agent Clank:
Play the game as intended—it's a tight, polished PSP platformer/shooter hybrid.