Where do you buy quick balls in Pokemon Diamond?

The Quick Ball in the Pokémon games are the kind of Pokeball that give higher chances of capturing a Pokémon if used early in the battle. If you have the Diamond version of these games, you won't find it easy to buy them in any regular store. For greater chances of getting some of these, head to the Pastoria City's Pokemart and also, to increase your chances, don't forget to visit the Elite 4 Pokemart.