Nidoking is the final evolution of the Nidoran male line and is known for its territorial nature and rock-hard hide. Its horn is harder than diamond and can shatter boulders with ease. The card's dual Poison/Ground typing made it versatile against multiple opponent types. Nidoking's regal appearance and powerful presence, combined with its connection to the Nidoran evolution family, made it a popular choice among collectors seeking powerful-looking Pokemon.