Massive Implants
Go to Black Water City, stand in front of the hover board girl, do side flips alternating sides each time. If you did it right her boobs grow alot. Then if you have beat the game go to movies and select welcome or the second one (don't remember the name) and her boobs are huge during the video too!
More tricks, tips and cheats for this game are right here - Ratchet & Clank cheats
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