Talk:Sanctuary/@comment-64.251.146.0-20160210073036/@comment-100.12.70.173-20160213215544

cardiacmassage's tumblr has a guide:

Get Star Platinum: The World, farm stat raising items for Jotaro (Carpenters' Customize on fake medicine) and Phantom Blood (zombie merchant next to the hotel in Cairo or 3 badge of honors to enable then disable King Crimson for 10 PB), Push It To The Limit to get Jotaro's damage up or close to 999 to outpace Cars' recovery.

Stop time, use his basic attack, basic attack again, repeat.

Alternatively, if you're really desperate, start a brand new game; Cars only becomes Ultimate Cars in your second playthrough and up. Beat normal Cars, beat the Creator with the arm, use the debug room to get the stats and items you had in your previous game.