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Pokémon Video Game Championship (shorten to VGC by the Pokémon fanbase) AKA Pokémon World Championships is the official competitive battle format. It is usually held in August by Play! Pokémon, which is formed by The Pokémon Intentional Company.
The differences between the battle format that Smogon used is the battle format is in official rather than fanfic, thus making the battle more fast-paced, less stally, and you win cool prizes. In addition, the player can only bring four Pokémon out of six Pokémon to the battlefield. Item Clause is in effect as well, meaning that two or more Pokémon in the team cannot hold the same item. And Mythical Pokémon isn’t allowed in any VGC format.