The Pokémon featured in the set, unlike in the three previous sets, are based on the featured Pokémon from the twelfth movie, specifically Arceus instead of a certain Trainer. This set marks the TCG debut of the final Generation IV Pokémon, Arceus. A new rule was introduced saying that players can have as many Arceus cards in their decks as they want.
The English prerelease card for this set is Raichu.
This set is the first one where Premier Events will require all cards be in either English or a local language depending on location, due to a change in policy for the 2009-10 season involving the usage of foreign language cards.