Pokemon Japanese Gym 1 Leaders' Stadium Booster Pack Japanese Gym Series Collection : r pkmntcgcollections The Poisonous Ninja Master Koga has such an interesting history compared to many of the named characters from Kanto. From his role as a gym leader then moving up to the Set of 8 Pokemon Gym Leader Cards and one 1st edition English Gym Leader card Gym Heroes Booster Pack Japanese Factory Sealed Vintage 1998 japanmaster title Challenge from the Darkness the original Gym Challenge, Japanese style compared to its predecessor, Leader's Stadium (Gym Heroes) this box definitely brings a darker aura to the sequel set!