How to obtain December 2015 / Battle Strengthening Set Grass/Fighting Included Included Cards Golem EX (PROMO) {F} 〈197/XY-P〉[XY-P] × 1 card Regirock (Uncommon) {F} 〈040/081〉[XY7] × 1 card Korni (Uncommon) {Supporter} 〈090/096〉[XY3] × 2 cards Fighting Stadium (Uncommon) {Stadium} 〈093/096〉[XY3] × 1 card Strong Energy (Uncommon) {Energy} 〈096/096〉[XY3] × 2 cards