LINE Yahoo has tightened the rules for Pokémon Card Game listings on its two Japanese resale marketplaces. Cartons, empty packaging and bulk listings of new products can no longer be listed. The change took effect on October 13, 2026.
What exactly did Yahoo Auctions and Flea Market ban on October 13, 2026?
LY Corporation (LINE Yahoo) worked with The Pokémon Company to ban three listing types on Yahoo! Auctions and Yahoo! Flea Market. The first is cards listed by the carton. The second is empty boxes and empty packs. The third is bulk listings of the same product within a set period after its release. The rules started on October 13, 2026, according to the LINE Yahoo press release. Both marketplaces operate only in Japan.
Quick Answer: Since October 13, 2026, Yahoo! Auctions and Yahoo! Flea Market have banned three kinds of Pokémon Card Game listing: cartons, empty boxes or packs, and bulk listings of new products. For 30th CELEBRATION boxes, the bulk-listing ban runs through October 31, 2026. Single cards can still be listed.
The Yahoo! Auctions rules notice lists the same three categories. It ties the bulk-listing rule to the BOX of the MEGA expansion pack "30th CELEBRATION," with that rule ending on October 31, 2026. The carton and empty-packaging bans are not tied to any one set.
| Banned listing type | What it covers | Time limit |
|---|---|---|
| Cartons | Pokémon cards listed by the carton, meaning a factory case that holds several booster boxes | None stated |
| Empty boxes / empty packs | Opened, empty packaging | None stated |
| Bulk listings after release | Many listings of the same product shortly after it comes out, starting with 30th CELEBRATION | 30th CELEBRATION BOX: through Oct 31, 2026 |
Japanese outlets report that the empty-box and empty-pack ban covers trading cards in general, not just Pokémon. KAI-YOU and Impress Watch both say so. The LINE Yahoo press release itself does not spell out that wider scope.
The penalties are set out in the Yahoo! Auctions notice. Listings that break the rules may be removed, and the accounts behind them may be suspended. This is not a full resale ban. Single cards and other products can still be listed as long as they follow platform rules, AUTOMATON reports.
How long does the mass-listing ban on 30th CELEBRATION boxes last?
The mass-listing ban on Yahoo! Auctions and Yahoo! Flea Market runs through Saturday, October 31, 2026. It covers only booster BOXES of the MEGA expansion pack "30th CELEBRATION," according to the official Yahoo! Auctions rules notice . The cut-off is not fixed. The notice says the period may change depending on circumstances.
The bulk-listing rule is narrower than the other two bans. Carton listings and empty boxes or packs are prohibited with no stated end date. The bulk-listing limit applies only for a set window after a product's release. Here is what the current window covers:
- Product: the BOX of Pokémon Card Game MEGA expansion pack "30th CELEBRATION"
- Start: October 13, 2026, the day LINE Yahoo announced the measures
- End: October 31, 2026, which may change depending on circumstances
- Platforms: Yahoo! Auctions and Yahoo! Flea Market, in Japan only
Future sets will probably get shorter windows. Nikkei reports that later Pokémon Card Game series will fall under the bulk-listing ban for about two weeks after release . The LINE Yahoo press release does not give that two-week figure. Until LINE Yahoo or The Pokémon Company confirm it, treat it as Nikkei's reporting.
The rules also do not define what counts as "bulk." KAI-YOU noted that the announcement gives no specific number of listings that would count as a mass listing . Sellers therefore have no published limit to stay under. Whether a listing breaks the rule is decided by the platform.
Under the Yahoo! Auctions notice, breaking the rule may lead to listings being removed and accounts being suspended . Sellers holding several 30th CELEBRATION boxes can relist after October 31 if Yahoo does not extend the window, or list a few boxes at a time before then. Neither option is guaranteed to stay within the rule, because no threshold has been published.
Why ban empty boxes? The resealing problem
Empty Pokémon boxes and packs are banned because sellers can use them to pass off resealed products as unopened ones. Japanese reports say this part of the October 13, 2026 rules applies to trading cards in general, not only to Pokémon Card Game products . Once empty boxes and packs can't be listed, buyers can no longer easily get the packaging used to make fake "sealed" stock.
Here is how the scam works, as KAI-YOU and Impress Watch describe it :
- A seller gets original packaging, either by buying empty boxes and packs or by opening products and keeping the packaging.
- The seller puts something other than the original contents into the packaging and reseals it.
- The product is then sold as unopened, and the buyer only finds out after opening it.
In its own press release, LINE Yahoo lists empty-box and empty-pack listings (空箱・空パックの出品) as one of three banned listing types on Yahoo! Flea Market and Yahoo! Auctions . The press release does not give a reason for this ban. The resealing explanation comes from the Japanese press coverage, not from LINE Yahoo.
The Yahoo! Auctions rules notice lists the same ban. It is not tied to one set or end date the way the 30th CELEBRATION bulk-listing rule is . As a result, sellers who used to sell empty packaging for display or storage can no longer list it on either Yahoo platform.
The new rules do not stop Pokémon resale on Yahoo altogether. AUTOMATON WEST reports that single cards and other products can still be listed if they follow platform rules . The rules focus on the formats most linked to fraud and stockpiling: cartons, empty packaging and bulk listings shortly after a release. Ordinary trading in single cards is still allowed.
How will LINE Yahoo enforce the new rules?
LINE Yahoo says it will remove listings that break the rules and may suspend the accounts behind them. The Yahoo! Auctions rules notice dated October 13, 2026 says the company will take steps such as deleting listings and may also restrict account use (source: Yahoo! Auctions, 2026-10).
The official notice sets out penalties but does not explain how LINE Yahoo will find rule-breaking listings. According to Nikkei, the company plans to use the following measures:
- AI and other tools check listings 24 hours a day, 365 days a year .
- Listings that break the rules are deleted.
- Accounts that break the rules more than once can be suspended.
- A transaction can be stopped even after the buyer has paid.
The AI monitoring and the 24/7 schedule come from Nikkei's report. They were not in LINE Yahoo's press release when we checked it. KAI-YOU also reported that the release does not say how many identical items count as a "bulk" listing. Sellers who list several units of the same product shortly after a release therefore have no published threshold to check against.
Part of the plan is information from The Pokémon Company itself. Under the new arrangement, Pokémon already shares details of new products with LINE Yahoo. It will now also share information on products and distribution that could lead to trouble or improper transactions in the secondary market (source: LINE Yahoo, 2026-10).
"Pokémon will add information about products and distribution that could lead to trouble or improper transactions in the secondary market to the new-product information it already shares," — LINE Yahoo Corporation, press release of October 13, 2026 (our translation; source: LY Corp.)
The two companies already had a formal agreement. They signed a memorandum of understanding in July 2023, agreeing to work toward a society where trading cards can be bought and sold safely . The date was reported by AUTOMATON WEST, and LINE Yahoo's own release gives it as well. The October 13 rules are the first measure under that agreement aimed directly at cartons, empty packaging and bulk listings of Pokémon products.
The sources we checked do not explain how buyers or other users can report listings that break the new rules. They also do not say whether accounts that are already suspended can appeal.
Yahoo vs Mercari: how do the 30th CELEBRATION resale rules compare?
Mercari's rule is wider than Yahoo's. Mercari bans listings of the 30th CELEBRATION products themselves, while Yahoo bans certain kinds of listing. Mercari covers unopened packs and all nine Card Sets, and its ban has no end date. Yahoo bans cartons and empty boxes or packs, and it bans bulk listings of 30th CELEBRATION boxes only through October 31, 2026 .
Mercari announced its rule on September 15, 2026, and it took effect at 00:00 on September 16, according to gamebiz . The ban applies to both Mercari and Mercari Shops. We could not find Mercari's own announcement page, so the Mercari details below come from press reports only.
- Unopened packs: listings of sealed 30th CELEBRATION expansion packs are banned .
- Card Sets: all nine 30th CELEBRATION Card Sets are banned, whether opened or unopened .
- Bundles: a listing that includes any banned item is also banned.
- Still allowed: opened single cards.
Mercari gave a reason for the ban, as reported by gamebiz. The rush of sales right after launch could lead to disputes between buyers and sellers and to harassment of trading partners. The ban lasts until Mercari decides it can keep trading safe again .
LINE Yahoo's rules took effect on October 13, 2026, on both Yahoo! Auctions and Yahoo! Flea Market . The ban on cartons and the ban on empty boxes and packs have no stated end date. Only the bulk-listing rule is tied to a release window.
| Item | Mercari | Yahoo! Auctions / Yahoo! Flea Market |
|---|---|---|
| Announced | September 15, 2026 (press reports) | October 13, 2026 |
| Effective | 00:00, September 16, 2026 | October 13, 2026 |
| Products covered | Unopened 30th CELEBRATION packs; all 9 Card Sets (opened or unopened); bundles containing them | Pokémon cards sold by the carton; empty boxes and packs; bulk listings of the 30th CELEBRATION BOX |
| End date | None set; lasts as long as Mercari judges necessary | Bulk-listing ban: through October 31, 2026. Carton and empty-packaging bans: no end date given |
| Enforcement | AI detection plus a specialist review team; listing removal and account restrictions for repeat offenders (press reports) | Listing removal and possible account suspension (notice); round-the-clock AI monitoring (Nikkei) |
| Still allowed | Opened single cards | Single cards and other products that follow platform rules |
Sources: AUTOMATON , Yahoo! Auctions notice , Nikkei , AUTOMATON WEST.
The practical difference for sellers: on Mercari, a sealed 30th CELEBRATION pack cannot be listed at all for now. On Yahoo, a single sealed box can still be listed. What is banned there is listing the same product in bulk, and neither LINE Yahoo nor the Yahoo! Auctions notice has said how many items count as "bulk," KAI-YOU reported.
What changed since Yahoo's launch-day stance in September?
Yahoo changed its position in four weeks. When 30th CELEBRATION launched in mid-September, Yahoo! Auctions and Yahoo! Flea Market said they would not ban the set's listings and would not cap prices, according to Otakuma . On October 13, 2026, LINE Yahoo reversed that position for three types of listing: cartons, empty packaging and bulk listings .
The September decision came as Mercari took the opposite approach. Mercari banned 30th CELEBRATION listings from 00:00 on September 16, 2026, the day the set launched, as gamebiz reported . Otakuma described the two companies as "splitting" on the issue. For the first weeks of the release, Yahoo's two marketplaces were the main large Japanese platforms where sealed 30th CELEBRATION product could still be listed with no special restriction.
Here is how Yahoo's rules for 30th CELEBRATION product changed between the two dates:
- Mid-September: no listing ban for the set and no price cap .
- October 13: cartons, empty boxes and empty packs, and bulk listings of the same product within a set period after release are now banned .
- Still allowed: single cards and other products that follow platform rules. AUTOMATON WEST notes that the new rules do not ban resale outright .
The rules arrived a week after LINE Yahoo began promoting trading-card sales. On October 5, 2026, the company announced zero sales fees for five TCG brands, including Pokémon, and a new "トレカタブ" (trading card) tab. It also said trading-card gross merchandise value on its services had grown to about 200% of the previous year's level . Neither LINE Yahoo release links the promotion to the new restrictions, and neither says why the company changed its September position.
Secondary reports from September said some sellers found workarounds to Mercari's ban, and some criticized Yahoo's rules as too loose. Those claims could not be checked against the sources used for this article, so they are mentioned here only as unconfirmed. Press reports said Rakuten Rakuma had announced no special restriction as of mid-September, and no later change from Rakuma was found.
What should collectors and resellers watch next?
Collectors and resellers should watch three things next. The first is the next 30th Celebration wave. The second is whether LINE Yahoo ends the bulk-listing ban for 30th CELEBRATION boxes on October 31, 2026 or extends it. The third is how the rule applies to later sets. The rules affect only how products can be listed in Japan. No source cited here shows whether they have changed prices or reduced scalping.
- October 23: Espeon ex and Umbreon ex Battle Decks. AUTOMATON WEST reports that the measure applies first to the Pokémon Card Game 30th Celebration set. It names the next wave as the Espeon ex and Umbreon ex Battle Decks, scheduled for October 23 . Only AUTOMATON WEST reports this, and the Yahoo! Auctions notice does not name these decks.
- October 31: end date for the 30th CELEBRATION BOX rule. The Yahoo! Auctions rules notice says the bulk-listing ban on the 30th CELEBRATION BOX runs through Saturday, October 31, 2026 . Check the same notice page for any extension or updated date.
- Later sets and the two-week window. Nikkei reports that later series will fall under the bulk-listing ban for about two weeks after release . LINE Yahoo has not published a quantity that counts as "bulk," so sellers cannot yet know the exact limit.
- Japan-only scope. The rules in the LINE Yahoo release cover only Yahoo! Flea Market and Yahoo! Auctions. Mercari's 30th CELEBRATION ban covers only Mercari and Mercari Shops. None of the sources cited here describe similar rules on marketplaces outside Japan.
The new rules have not been in place long enough to measure. None of the sources reviewed for this article give data on sell-through, average resale prices or listing volumes for 30th CELEBRATION products before and after the October 13 rules or Mercari's September 16 ban. Any claim that the bans have lowered prices or ended scalping is unconfirmed for now.
Under its arrangement with The Pokémon Company, Pokémon will add warnings about products that could lead to trouble or improper trading to the new-product information it already shares with LINE Yahoo . That suggests similar restrictions could come with future releases. For sellers in Japan, the safest approach is to list single cards and individual products, not cartons, empty packaging or many copies of the same item. Before any new release, they should also check the current Yahoo! Auctions and Mercari notices. This article describes platform rules only and does not give buying or selling advice.
Frequently Asked Questions
Can I still sell single Pokémon cards on Yahoo Auctions after October 13?
Yes. On Yahoo! Auctions and Yahoo! Flea Market, the October 13, 2026 rules cover only three types of listing: cartons, empty boxes and packs, and bulk listings of the same product . According to AUTOMATON WEST, single cards and other products can still be listed if they follow platform rules .
Are sealed 30th CELEBRATION booster boxes banned on Yahoo Auctions?
Sealed boxes are not banned outright, but listing many copies of the same box is. The Yahoo! Auctions rules notice applies the bulk-listing ban to the BOX of Pokémon Card Game MEGA expansion pack "30th CELEBRATION" until Saturday, October 31, 2026 . Separately, the bans on carton listings and on empty boxes and packs apply to Pokémon Card Game products in general, with no end date. The release does not say how many copies count as "bulk," as KAI-YOU reported.
Does the Yahoo ban apply to other trading card games?
Only partly. Japanese coverage from KAI-YOU and Impress Watch says the empty-box and empty-pack ban covers trading cards in general. The reason given is that empty packaging can be used to reseal products and sell them as unopened . The carton and bulk-listing rules are described for Pokémon Card Game products only.
How is Mercari's ban different from Yahoo's?
Mercari's ban is broader and has no end date. According to gamebiz, from 00:00 on September 16, 2026, Mercari and Mercari Shops banned unopened 30th CELEBRATION expansion packs and all nine 30th CELEBRATION Card Sets. The Card Sets are banned even when opened. Opened single cards are still allowed . Yahoo's rules cover cartons, empty packaging and a temporary bulk-listing ban that runs to October 31, 2026. Mercari's own announcement page could not be found, so these details come from press reports.
Has the ban stopped scalping?
No source has measured the effect yet. The Yahoo rules took effect on October 13, 2026 , and neither LINE Yahoo nor The Pokémon Company has published data on listings removed or on price changes. Both the Yahoo and Mercari measures apply only to their Japanese platforms. They do not change resale rules on marketplaces outside Japan.
SnapHolo prices for the cards and sets in this article
| Card | Edition | Rarity | SnapHolo price |
|---|---|---|---|
| Mew R | Japanese | RGB Rare | ¥700,000 |
| Mew B | Japanese | RGB Rare | ¥540,000 |
| Mew G | Japanese | RGB Rare | ¥460,000 |
| Charizard 137 | Japanese | ¥21,500 | |
| Lugia 142 | Japanese | Classic Collection | ¥20,500 |
| Pikachu ex 127 | Japanese | SAR | ¥7,500 |
| Mew ex 135 | Japanese | FUR | ¥7,400 |
| Mew ex 129 | Japanese | SAR | ¥6,500 |
| Magikarp 165 | Japanese | Classic Collection | ¥6,199 |
| Pikachu ex 126 | Japanese | SAR | ¥6,100 |
| Mewtwo ex 134 | Japanese | FUR | ¥4,900 |
| Gengar ex 131 | Japanese | SAR | ¥4,700 |
| Gengar 150 | Japanese | ¥4,200 | |
| Pikachu 136 | Japanese | ¥3,750 | |
| Mewtwo ex 128 | Japanese | SAR | ¥3,300 |
| Sylveon ex 130 | Japanese | SAR | ¥2,970 |
| Jirachi ex 132 | Japanese | SAR | ¥2,499 |
| Greninja ex 125 | Japanese | SAR | ¥2,200 |
| Rayquaza ex 154 | Japanese | Classic Collection | ¥2,100 |
| Pikachu & Zekrom GX 160 | Japanese | Classic Collection | ¥2,000 |
| Mew VMAX 163 | Japanese | Classic Collection | ¥1,800 |
| Fuecoco ex 124 | Japanese | SAR | ¥1,500 |
| Salamence ex 133 | Japanese | SAR | ¥1,500 |
| Misty 138 | Japanese | ¥1,500 | |
| Shining Celebi 141 | Japanese | Classic Collection | ¥1,300 |
| Dark Tyranitar 144 | Japanese | Classic Collection | ¥1,300 |
| Ho-Oh 7 | Japanese | C | ¥1,000 |
| Fuecoco ex 9 | Japanese | RR | ¥1,000 |
| Slowpoke 10 | Japanese | C | ¥1,000 |
| Pikachu 17 | Japanese | Pikachu Rare | ¥1,000 |
Ungraded card prices as of 2026-10-18 (KST).
Sources: LY Corp. · Yahoo! Auctions notice · KAI-YOU · Impress Watch · AUTOMATON · Nikkei · gamebiz · AUTOMATON (2) · Otakuma
