Holon Research Tower, released in October 2005 during the PCG era, is a 86-card set that introduced the Delta Species mechanic, a unique typing variant that created significant collector demand. The set features several iconic Pokemon in their Delta forms, blending Psychic and Metal types with classic creatures, making it a cornerstone set for Delta Species enthusiasts. This relatively small set from the mid-2000s has maintained strong secondary market prices, particularly for its rare Holos and the notably valuable Ditto cards.
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