How much is a PSA 9 Misty's Gyarados #13 worth?
The PSA 9 Misty's Gyarados #13 from Gym Challenge (English) has a median market value of $318, with recent sales ranging $282 to $375 — based on 6 recent graded sales.
Is a PSA 9 Misty's Gyarados #13 worth more than ungraded?
Yes. A PSA 9 copy has a median value of $318 versus about $89 ungraded — roughly a 3.6× premium for the PSA 9 grade.
Where do PokéTT's PSA 9 prices come from?
PokéTT tracks real graded sales across eBay, Yahoo Auctions and Mercari, then shows the median within the PSA 9 grade — not a single outlier sale — so the mark reflects the true market.