Gym Challenge, released in October 2000, is the second set in the Gym series and features Pokémon trained by the iconic Kanto gym leaders, establishing a key pillar of early 2000s TCG collecting. As part of the original Japanese-era sets, it holds significant nostalgic value and represents a critical period when the TCG was experiencing major growth in Western markets. The set's character-focused rare holos, particularly the gym leader variants of classic Pokémon, have become highly sought after by vintage collectors.
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