Aquapolis: How to Identify Cards From This Set

• Continuing the dot-code wide-border design (Pokémon-e series), this set introduced Crystal Pokémon rarity
• Crystal Pokémon have a 'Crystal Type' ability: they temporarily change their own type to match the Energy attached to them
• Rare Holo cards have their own H-prefixed numbering (H1-H32), and some cards also carry a letter suffix (e.g. ##a/##b)
• Different cards carry different dot-code data — even cards with identical artwork may be numbered separately because their dot-code content differs

Aquapolis and Skyridge are nearly identical in design, Crystal Pokémon mechanics, and H-numbering system; they can be told apart by total card count (Aquapolis 186 cards vs. Skyridge 182 cards), but no verbatim source describing the specific set-symbol differences was found, so they are not listed under commonly_confused_with.

• Bottom-left or bottom-right corner: the set symbol and the collector number (e.g. 4/102) tell you the set; older cards have no symbol at all, which itself narrows them to Base Set.
• Left of the number: a 1st Edition stamp, if present, sits below the art on WOTC-era cards.
• Regulation mark (a letter in a box near the bottom, D through H so far) dates modern cards to a two-year window.
• Back of the card: the blue Poké Ball back has changed little since 1999; a washed-out, blurry or wrongly colored back is the first sign of a fake.

Lay the card flat on a dark surface in daylight, straight on, with the whole card in frame, then a close-up of the bottom edge where the set symbol, number and any edition stamp sit. Tilt holo cards under the light for a second shot to show the foil pattern. Photograph the back too. The app reads the card and set; the edition and rarity checks above tell you which version you have.