GX Battle Boost (Japanese: ハイクラスパック「GXバトルブースト」High Class Pack: GX Battle Boost) is the name given to the fourth Japanese sub-set released during the Sun & Moon Era of the Pokémon Trading Card Game. An enhancement of the fourth expansion, Awakened Heroes and Ultradimensional Beasts, it continues the introduction of Generation VII Pokémon and Pokémon-GX into the card game, while providing new prints of Pokémon already included in the fourth expansion.
The GX Battle Boost is a 114 card subset released on October 20, 2017 in Japan. This subset is considered a supplement to the fourth Sun & Moon Era expansion, Awakened Heroes and Ultradimensional Beasts, providing new prints of cards already introduced in the fourth expansion, while debuting additional Generation VII Pokémon. It focuses on the Ultra Beasts and Pokémon-GX. All the cards included within the sub-set are Mirror Holofoil.