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PSA 10: PriceCharting; refreshed Sep 10, 2026
GemDelta shows Professor Cozmo's Discovery (Deoxys #90) at $7.35 market price (TCGplayer market). Its Delta multiple is 20.9x.
A PSA 10 Professor Cozmo's Discovery (Deoxys #90) is currently shown at $154. GemDelta labels this as an unverified PriceCharting guide fallback rather than verified recent sales.
GemDelta records a 6.98% gem rate for Professor Cozmo's Discovery (Deoxys #90), with 3 PSA 10 copies out of 43 total PSA grades and a 20.9x Delta. That describes the grading profile; it is not financial advice.
The Reverse Holo version of Professor Cozmo's Discovery (Deoxys #90) is shown at $7.35 market price. That value is for this stored card variant, not the base printing.