A Pokémon will have its Cool condition raised when fed Pokéblocks or Poffins made with Berries that have a spicy flavor. Pokémon with Natures that boost Attack—Lonely, Brave, Adamant, and Naughty—get the most benefit from spicy-tasting Berries, as a result, they are the easiest to raise for a Cool Contest.
At the end of a Cool Contest, the winning Pokémon will receive a Contest Ribbon. Additionally, in Pokémon Diamond, Pearl, and Platinum, Coordinators are awarded special Accessories the first time they win the Contest. Different Ribbons and Accessories are awarded for winning in each of the four ranks.