2005-10-28 • 86 cards
Holon Research Tower is a 86-card set from the PCG era (October 2005) that introduced the Delta Species mechanic, a unique gimmick featuring Pokémon with altered types and nostalgic artwork. The set is notable for its scarcity and the popularity of Delta Species cards, which have maintained strong collector demand nearly two decades later. As an older PCG-era release with limited print runs, this set represents a key piece of mid-2000s Pokémon TCG history.
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