Base Set Potion) all printings of cards with errata may be used in sanctioned tournaments. The exception is cards that have received errata (e.g. Pokémon Fan Club from Aquapolis compared to its Ultra Prism iteration) those cards cannot be used in sanctioned tournaments. However, some cards significantly differ in wording between older prints and newer prints (e.g. If a card in an Expanded-legal expansion is a reprint of an older card, all prints of the card can be played in an Expanded-legal expansion-legal deck (e.g. Starting from 2016, they were added to the current Rotation on the third Friday in the month of release. Additional expansions are added to the current Rotation three weeks after they are released in the United States. It remains to be seen if Play! Pokémon will ever rotate sets out of the Expanded format, as they currently do with Standard format.

It was also used in the Pokémon Trading Card Game Online. It allows a greater number of expansions than Standard format but is not as unpredictable in card combinations as Unlimited format. It was added to the Standard format in the 2014-2015 season.

The Expanded format (Japanese: エクストラレギュレーション Extra Regulation format) of the Pokémon Trading Card Game is one of two formats used for officially-sanctioned Play! Pokémon events. Pokémon Brilliant Diamond and Shining Pearl.