This page is a Pokémon TCG research view for Brock's Onix #21. Use it to compare grade price points, scan price history when available, check liquidity context, review PSA population data when present, and browse live eBay listings related to the card. Recent guide-style prices on PokeGoTo include PSA 10 around $122, PSA 9 around $22, ungraded around $9. Over roughly the last 12 months, the PSA 10 guide price has moved about +38%.

Listing prices and sold comps can differ from guide figures depending on condition, grading company, and seller terms. Treat everything here as educational market context — not a valuation certificate or investment advice.

From here you can add the card to a collection or buy list (including as a guest with limits), open the parent set checklist, or compare similar prints when you’re deciding what to chase next.