Also,like said above,Part 2 is great.Don't worry,you won't run out of opponents.However,there is only one pair in the Abandoned Dorm,so don't go there searching for more.A good tip is that you challenge those that wager 5 medals.Don't worry if you have to duel Obelisks,since they aren't the so-strong-that-are-so-cocky that say "Hmph.I win." when they win.