Included in each Build & Battle Box is a 23-card Evolution pack that includes one of four specially stamped Prerelease cards for the expansion, as well as four booster packs. The Prerelease cards for the Celestial Storm expansion are Kyogre, Manectric, Delcatty, and Celesteela, with each containing a group of Pokémon cards that are focused around the following types respectively: Water-type, Lightning-type, Psychic-type, and Metal-type.