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PSA 10: PriceCharting; last PSA 10 sale Mar 31, 2026
GemDelta shows Brock's Onix (Gym Heroes #21) at $15.91 market price (TCGplayer market). Its Delta multiple is 23.9x.
A PSA 10 Brock's Onix (Gym Heroes #21) is currently shown at $345. GemDelta labels this as an unverified PriceCharting guide fallback rather than verified recent sales.
GemDelta records a 18.0% gem rate for Brock's Onix (Gym Heroes #21), with 53 PSA 10 copies out of 294 total PSA grades and a 23.9x Delta. That describes the grading profile; it is not financial advice.
| Date | Sale |
|---|---|
| Mar 31, 2026 | $285.00 |
| Mar 15, 2026 | $405.00 |