![Thundurus EX [1st Edition] #20 from Pokemon Japanese Thunder Knuckle](https://pokeinvest-japanese-card-images.nyc3.cdn.digitaloceanspaces.com/Thunder_Knuckle/033_Thundurus_Ex_20.jpg)
Thundurus EX [1st Edition] #20 PSA 10: price & population
PSA 10
$73.38
Raw
$3.99
PSA 10 pop
37
Gem rate
50.0%
A PSA 10 Thundurus EX [1st Edition] #20 from Japanese Thunder Knuckle sells for $73.38 — a 1,739% premium over the $3.99 raw price. PSA has graded this card 74 times; 37 came back a 10 (50.0% gem rate), and 22 a PSA 9.
The 9-to-10 spread
PSA 9 sells for $27.20. The jump from 9 to 10 is worth $46.18 — that spread, times your real odds of the 10, is what decides whether grading pays.
The September 2026 Grade Report ranks the 30 most profitable cards to grade right now, by expected profit after every fee. Same math as this page, run across the whole market. $19, one time, instant.
See the top 30 →Prices from real completed sales, updated daily. Population data from PSA's public population report.
