Here are the rivals for each of the teams in Madden 2005 :
Bears Rival : Green Bay
Bengals Rival : Cleveland
Bills Rival : Miami
Broncos Rival : Oakland
Browns Rival : Pittsburgh
Buccaneers Rival : Green Bay
Cardinals Rival : Dallas
Chargers Rival : Oakland
Chiefs Rival : Oakland
Colts Rival : Tennessee
Cowboys Rival : Washington
Dolphins Rival : Buffalo
Eagles Rival : NY Giants
Falcons Rival : New Orleans
49ers Rival : Dallas
Giants Rival : Philadelphia
Jaguars Rival : Tennessee
Jets Rival : Miami
Lions Rival : Green Bay
Packers Rival : Chicago
Panthers Rival : Tampa Bay
Patriots Rival : Buffalo
Raiders Rival : Denver
Rams Rival : San Francisco
Ravens Rival : Pittsburgh
Redskins Rival : Dallas
Saints Rival : Atlanta
Seahawks Rival : Oakland
Steelers Rival : Cleveland
Texans Rival : Tennessee
Titans Rival : Pittsburgh
Vikings Rival : Green Bay