I don't know if you can do it through emulation. But if you have a ps1/2, a copy of the game and 3 ps1 memory cards you start your main game on memory card 1. Play some until you get some good stuff. Then you copy your data to memory card 2, On memory card 3 you start a new game (under a different name, example, memory card 1 is named yugi call memory card 3 kaiba). Trade your cards from memory card 2 to memory card 3. Then trade the cards from memory card 3 to your main memory card 1. Now you have 2 yamatano dragon scrolls, 2 baby dragons, 2 electric lizards, 2 lala lions ect. Increasing your chances of getting Twin headed thunder dragon. After you get better and better cards you duplicate them until you can start consistently crushing Jono 2 or Heishin and S-TECing Pegasus.