We check PSA 10 sales data every day for the Japanese cards we track. Each chart below shows the monthly average PSA 10 sold price, the PSA 10 rate and the number of PSA 10s, all from official PSA data.
Still climbing
These rose every month from August to October.
Articuno Old Back · Fossil

August $1,115 → September $1,950 → October $1,980 (+78% since August).
Bouncing back
These dipped in September and picked up again in October.
Victreebel Old Back · Jungle No.071

August $600 → September $476 → October $550 (+16% since September).
Kabutops Old Back · Fossil No.141

August $750 → September $670 → October $768 (+15% since September).
Pikachu & Zekrom GX SA · Tag Bolt 101/095

August $4,400 → September $3,890 → October $4,353 (+12% since September).
Wobbuffet Old Back · Crossing the Ruins No.202

August $697 → September $624 → October $696 (+11% since September).
Primal Kyogre EX UR · Bandit Ring 093/081

August $1,529 → September $1,300 → October $1,425 (+10% since September).
Dark Blastoise Old Back · Team Rocket No.009

August $2,829 → September $2,087 → October $2,271 (+9% since September).
Dark Vileplume Old Back · Team Rocket No.045

August $599 → September $489 → October $526 (+8% since September).
Sliding
These fell every month. If one is on your list, it now sells for less than it did in August.
Sylveon V SA · Eevee Heroes 083/069

August $268 → September $228 → October $194 (-28% since August).
Galarian Moltres V SA · Matchless Fighters 078/070

August $455 → September $347 → October $345 (-24% since August).
Solgaleo & Lunala GX SA · Dream League 063/049

August $496 → September $448 → October $407 (-18% since August).
Charizard V SA · Star Birth 103/100

August $363 → September $323 → October $306 (-16% since August).
Holding steady
These barely moved from August to October.
Slowpoke Old Back · Fossil No.079

August $460 → September $578 → October $445 (-3% since August).
Erika's Dragonair Old Back · Leaders' Stadium No.148

August $734 → September $810 → October $784 (+7% since August).
Leafeon VMAX HR · Eevee Heroes 089/069

August $571 → September $554 → October $529 (-7% since August).
Monthly average of PSA 10 sales. October = through October 15. Source: PSA. Past prices do not guarantee future prices.
We also post a weekly version on Instagram at @jpretrogamestore.