Poké Ball Customization (or Pokéseals for short) are stickers that you can put on your Poké Balls. Each of these Pokéseals gives a another Aura when your Pokémon comes out of his/her Poké Ball.
Before you can buy Pokéseals you must have a Seal Pack, you can get that Item in a house just west from the Unown Ruins. And after that you can go to a Pokémart And Buy a Pair of Seals. Pokéseals are very Cheap they from 50 to 150 pokedollars. And you can have so many as you will, cause they are very cheap.
If you have purchased the Pokéseals you must go to a Pokémon Center. Go to your PC and select the Second option of the menu. Then you Select the second option as Twice. You can now choose about 12 Pokeseals. Tap your Nintendo DS (Lite) stylus on one of the Pokéseals. Hold your stylus on the screen and take the Pokeseal to a place on the Poké Ball.
These are the Pokéseals that you can Purchase:
There are many secrets behind the Cute - looking Pokéseals. A sample of one: the A to Z Seals has All the Letters. And you can ONLY get this when you catch a Unown with the letter what you want. The Shock and Mystery Seals are the same as A-Z Seals, but you must catch Unowns A-Z first and go through the Ruin Maniac Cave in Route 214 to catch Unowns ? and !.