From Bulbapedia, the community-driven Pokémon encyclopedia.
Similar to Theme decks, World Championship decks are purchasable non-tournament-legal prints of 60-card decks used by World Championship players. These decks are a great way for players to see what it is like to play some of the top player constructed Decks in the world and see how others have used cards that may be available in their own personal collection. The Pokémon World Championships are an official, annual event organized by Play! Pokémon. It has been an invitational-only event since 2004. Players are chosen on overall ratings, national champions and past performances in the previous year's World Championships.
World Championships Deck List