SWSH07: Evolving Skies Gyarados V #28: PSA 9 vs PSA 10

SWSH07: Evolving Skies Gyarados V #28 shows one of the widest gaps in vintage WOTC between PSA 9 and PSA 10: a $106 dollar gap, with the gem mint multiplier at 6x. Based on the most recent PSA 10 sale of $75.00 on Apr 30, 2026, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.

SWSH07: Evolving Skies Gyarados V #28 Holo

PSA 10

$127.50

Last sale $75.00 on Apr 30, 2026 UTC

PSA 9

$21.24

Last sale $25.99 on May 11, 2026 UTC

PSA 8

$10.50

Last sale $10.50 on Mar 28, 2026 UTC

The Spread

The PSA 9 to PSA 10 spread on Gyarados V #28 SWSH07: Evolving Skies.

$106

Dollar gap, PSA 9 to PSA 10

PSA 10 sells for 6x a PSA 9

Three-Outcome EV Calculator

PSA 9 acquisition cost ($)

PSA resub cost ($)

Probability of each outcome (must total 100%)

PSA 10 (upgrade) 15%

PSA 9 (regrade) 70%

PSA 8 (downgrade) 15%

Defaults are conservative starting points. Adjust based on the specific slab. A borderline 9 with strong centering plays differently than a 9 with edge wear.

PSA 10 outcome (sale price minus resub minus acquisition) $0

PSA 9 outcome (regrade, no upgrade) $0

PSA 8 outcome (downgrade, slower sell, tied capital) $0

Expected Value

Math favors holding the 9

SWSH07: Evolving Skies #28 Gyarados V Holo released in 2021 sits in the vintage WOTC tier where gem-mint premiums above $106 are common. PSA 10 populations shrink faster than supply on cards of this era, which is why the upgrade arbitrage stays alive.

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