One of the most tedious, time consuming things to do on ffviii is to complete the queen of cards side quest. It can take many hours of moving between towns and losing rare cards. However it is well worth doing if your a game perfectionist as it gives you access to 5 new rare cards: Chubby Chocobo, Phoenix, Doomtrain, Kiros and Irvine.
Fortunately once you have made it to disk 4 you can simply challenge the queen of cards and she will play each of the rare cards. The only catch is that she is (in my opinion) the hardest card player to beat due to the fact that she combines plus, random and other rules with boss, player, and GF cards. However it is still much quicker to acquire the Chubby Chocobo, Phoenix, Doomtrain, Kiros and Irvine cards this way.
To find the queen of cards...