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.
Bouncing back
These dipped in September and picked up again in October.
Dark Hypno Old Back · Team Rocket No.097

August $424 → September $416 → October $459 (+11% since September).
Pikachu · Premium Champion Pack 036/131

August $271 → September $245 → October $295 (+20% since September).
Sliding
These fell every month. If one is on your list, it now sells for less than it did in August.
Venusaur EX SR 1st Edition · 20th Anniversary 088/087

August $1,365 → September $1,187 → October $1,021 (-25% since August).
Magikarp · VMAX Rising 020/070

August $190 → September $187 → October $147 (-22% since August).
Mega Gardevoir ex MUR · Mega Symphonia 092/063

August $740 → September $642 → October $588 (-21% since August).
Reshiram ex SAR · White Flare 168/086

August $226 → September $208 → October $179 (-21% since August).
Holding steady
These barely moved from August to October.
M Charizard EX SR 1st Edition · 20th Anniversary 091/087

August $3,297 → September $3,115 → October $2,825 (-14% since August).
Monthly average of PSA 10 sales. October = through October 17. Source: PSA. Past prices do not guarantee future prices.
We also post a weekly version on Instagram at @jpretrogamestore.