Not really.
Rocky - Rocky is a boxer with nothing going for him. He falls in love with a quiet girl named Adrian. He gets a chance to fight the world champion, Apollo Creed and goes the distance, losing by a split decision.
Rocky II - Creed wants a rematch with Rocky b/c people are giving him a hard time for not beating him cleanly. This time Rocky wins, taking the title from Creed. He also marries Adrian.
Rocky III - Rocky & Adrian have a baby, Adrian almost dies. Mr T beats Rocky and Creed trains him to help him win again.
Rocky IV - Dolf Lungren plays a juiced up Russian boxer. He fights Creed and kills him in the ring. So Rocky goes to Russia to train and fight him. He wins.
Rocky V - Rocky retires from boxing. Adrian's idiot brother loses all of Rocky & Adrian's wealth in a bad investment, so Rocky is broke and moves back to Philadelphia. He doesn't want his son to fight, but starts training a kid named Tommy Gun (yep). The son hates Rocky and gets a stupid looking earring. A weasel of a manager seduces Tommy to leave Rocky and come fight with him. He beats the champ that became champ after Rocky retired, but it doesn't mean anything because that champ wasn't good at boxing, so he goes and has a street fight with Rocky, who beats the crap out of him. Rocky and his son make up, sort of. This one is by far the worst one.
Rocky Balboa - Rocky is old, Adrian has died and Rocky is estranged from his son. He fights the current champ and makes his son proud. It's actually one of the better ones, even if it's far fetched.
Creed - You're caught up. Go watch it.