Diamond and Pearl have a different system for customizing Poke Balls. In these games, you can obtain Poke Ball Decorations by:
* Completing the National Dex: Once you complete the National Pokedex, you can receive a Special Ribbon from the professor. This ribbon can be used to decorate your Poke Balls.
* Winning Contests: Winning Contests with your Pokemon will reward you with Contest Ribbons, which can also be used to decorate Poke Balls.
* Finding Hidden Items: Some hidden items, such as Special Decorations, can be found throughout the game and used to decorate your Poke Balls.
If you're playing Pokemon Black and White or later games, then you can obtain Poke Ball Seals from various sources:
* Buying them from shops: Shops in various towns and cities will sell different types of Poke Ball Seals.
* Receiving them as rewards: You can receive Poke Ball Seals as rewards for completing certain events or challenges.
* Finding them in hidden locations: Some Poke Ball Seals can be found hidden in certain areas of the game.
Remember, Poke Ball Seals and decorations are purely aesthetic and don't affect the performance of your Poke Balls in any way.