Aquapolis, released in 2003, was the second set released in the E-reader series, and arguably one of the most sought after. Aquapolis was the first set to introduce "crystal Pokemon," Pokemon with different sub letters. For instance, Golduck has # 50a and 50b. Both cards have the same art, but different "swipe information," which is when you input the E-reader into a Gameboy Advanced.

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On Nov 14, 2022 at 09:04:01 PST, seller added the following information: