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PSA 10: PriceCharting · last PSA 10 sale $54.01 on Aug 20, 2026 · checked Oct 27, 2026
Grade 9: No recent PSA 9 sales. PriceCharting Grade 9 guide, mixing PSA, CGC, BGS, SGC and TAG 9s.
Grade 7 and Grade 8 are PriceCharting guides across all graders (PSA, CGC, BGS, SGC, TAG).
GemDelta shows Professor's Research: Professor Willow (Go #84) at $9.35 market price (TCGplayer market). Its Delta multiple is 4.21x.
A PSA 10 Professor's Research: Professor Willow (Go #84) is currently shown at $39.40. GemDelta labels this as a PriceCharting guide fallback rather than verified recent sales.
GemDelta records a 49.0% gem rate for Professor's Research: Professor Willow (Go #84), with 241 PSA 10 copies out of 492 total PSA grades and a 4.21x Delta. That describes the grading profile; it is not financial advice.
| Date | Listing | Sale |
|---|---|---|
| Aug 20, 2026 | Pokemon TCG Professor's Research Pokemon Go 084/078 Secret Rare PSA 10 084/078 | $54.01 |
| Jun 29, 2026 | PSA 10 - Pokemon Go - Professor's Research - 078/078 - Full Art Ultra Rare 078/078 | $39.99 |
| Jun 12, 2026 | 2022 POKEMON TCG POKEMON GO PROFESSOR'S RESEARCH 084/078 SECRET RARE PSA 10 084/078 | $28.00 |
| May 24, 2026 | PSA 10 - Pokemon GO - Professor's Research - 084/078 - Hyper Secret Rare 084/078 | $36.35 |
| May 22, 2026 | PROFESSOR'S RESEARCH WILLOW 2022 POKEMON GO SECRET FULL ART 084/078 PSA 10 Q1345 084/078 | $28.90 |
| May 3, 2026 | 2022 POKEMON GO SECRET #084 FULL ART/PROFESSOR'S RESEARCH PSA 10 #084 | $48.99 |