Change the Music
Start a new game, and when prompted to enter your name, type the first letter (the Japanese "A") 8 times. Once you are playing, you'll notice the music will be different.
Increase your Attack and Defense to 30
When entering a password, swap the 5th and the 35th character with each other. Also, swap the 10th and the 40th character with each other. When you begin the game again, your attack and defense will be 30.