First game March 1973.
Dislike rather than see as rivals:
Man Utd
Man City
I work in Manchester with many Man Utd and Man City "fans", most of whom couldn't find either ground if you gave them an A to Z.
Also absolutely hate to see people walking round Oldham in United and City shirts, support you're home town team FFS.
Rivalries:
Tranmere, Huddersfield, Blackpool probably as they are the localish teams we've played most over the years.
Also hate Millwall but that's just because they are such a horrible club with horrible fans.