http://www.imdb.com/title/tt0089927/
Truly this should be on the top 100 films of all time. It has everything a movie needs to be succesful. A good plot, great emotional depth (who didn't feel sad when Apollo died, or when Balboa fought the greased up swede?) and best of all, it features Balboa (Balboa>all, != God).
The movie starts of with a small intro from Rocky III (which automatically makes a top 10 best movies ever), and movies into the depressing fight between Creed and Drago. After that, Rocky goes to Siberia, and trains old skool, breaking rocks and splitting wood. The final (hearpounding) fight follows, and no dry eye was left in the house.
Truly a powerhouse film.