You need to play in a region that doesn't have the rule and has a rule that doesn't exist in the region with the random rule. Reject all choices to make you play the game with combined rules until you can play with the non random rule then you travel back to the regions that do have the random rule and play a game with mixed rules and hope that random is the rule that gets removed.

You will basically need to soft reset to get it to work. Also, there is a guy in Balamb by the docks, he's a Garden student who likes to skip class. Playing him will rest all of Balamb (and B. Garden) rules to simply the One trade rule. This is great for trying to build a region to get rid of the random rule.

CC can be started by finding and beating the members in order.

Jack - by the location panel located from the stairs leading to the elevator on floor one of Balamb Garden

Club - Located in the 1 floor of Balamb Garden close to the entrance leading to the Dormitory

Diamond - the two girl that appear in the same area as Jack. They are both the Diamond team.

Spade - The guy on floor 2 of Balamb Garden, by the elvator. He's the guy who gives you the first pack of cards in the beginning of the game.

Joker - Is a guy that randomly appears in the training area on the little island like figure. He normally sells you stuff but can be challenged. He has the Leviathan card.

Queen - You can't face Queen til Balamb becomes mobile. She is Xu and can be found on the bridge to control the Garden. She has the Carbuncle card.

King - Go face Dr. Kadowaki and she will tell you that she was the former King but handed off the title to someone new. Take Squall to his room and approach his bed. Choose to go to sleep by yourself (basically, remove all party members) and King will randomly appear to wake you up in the evening to challenge you to a game. King has the Gilgamesh card.