To get Ball Capsules you must have the Seal Case then you go to Sunyshore City. Go up until you see a building that has ribbons on it. Go inside it and walk up to a man with glasses. He will let you buy Ball Capsules. When you buy one, go to the Pokemon Center. Go to the PC. Go on your file. Go to Ball Capsules and select a Pokeball. You will see an icon. Use your stylus and drag the icon to the Pokeball. You can put on as many as desired. Select "Confirm" and you have made a Ball Capsule.