Start with the condition fields that make the category hard to buy
The pages below are organized by buyer decision rather than by a flat list of SEO keywords. Start with the stage or risk you need to resolve, then move to marketplace or category detail only when it changes the purchase.
Pokémon cards
Card number, rarity, print and surface condition.
Reference, movement, accuracy claim and service history.
Category pages focus on different failure modes
A Pokémon card page should care about card number and surface evidence; a camera page should care about exact model and functional/optics notes; fashion needs measurements; figures need release identity and box/accessory state. Those category-specific checks are the reason separate pages exist.
Move from category research to a real listing
Once the category guide has defined the evidence you need, return to Mercari, Yahoo Auctions or the relevant retailer and capture the exact source offer. The listing—not the category article—remains the purchase record.
Choose the category before evaluating condition
The evidence that matters changes by product. Cards need number/print/surface checks; watches need reference and movement claims; cameras need functional and optics evidence; fashion needs measurements; games need region/model and included components. Category selection should therefore alter both search filters and the buyer checklist.
Category pages should not pretend to authenticate
Proxy Japan can preserve seller evidence and explain what to inspect, but a marketplace photo or translated description is not independent authentication. High-value authenticity-sensitive purchases should be presented with that limitation rather than converting a checklist into a guarantee.