![Brock's Onix [1st Edition] #21](https://storage.googleapis.com/images.pricecharting.com/1ebd0aa487ab814b66839b68034e1592c81bc7580884eaa324d4e2792752299f/1600.jpg)
Pokemon Gym Heroes · #21 · Aug 2000
Should You Grade?
The gem rate is only 18% — you'll need a very clean copy to hit PSA 10. Only 79 sales per year — it may take time to find a buyer at full price.
Factors in grading cost, turnaround time, and compounding — how fast you can reinvest profits into the next flip.
Shows the best-value tier from each grading company based on EV, cost, and turnaround. Pop = total graded population; 10s = grade 10 count.
