This is a fairly rare coin that uses white plastic as its basic material. When exposed to UV rays, it turns yellow, making it very difficult to find beautiful pieces. White coins stand out and look cool, but perhaps because of the problem of discoloration, no white coins have appeared since then.
As this coin commemorates the 25th anniversary of Pokemon cards, the back side is also colored gold to match the front side. It seems that this color was chosen in consideration of the discoloration caused by ultraviolet rays, which was a weak point of the Pokemon VS emblem coin. Pokemon coins are basically black-backed, and you can differentiate them by changing them to a different color, making them a commemorative coin that satisfies the desire to own one.