How much is a PSA 8 Rocket's Mewtwo #14 worth?
The PSA 8 Rocket's Mewtwo #14 from Gym Challenge (English) has a median market value of $811, with recent sales ranging $430 to $1,000 — based on 8 recent graded sales.
Is a PSA 8 Rocket's Mewtwo #14 worth more than ungraded?
Yes. A PSA 8 copy has a median value of $811 versus about $322 ungraded — roughly a 2.5× premium for the PSA 8 grade.
Where do PokéTT's PSA 8 prices come from?
PokéTT tracks real graded sales across eBay, Yahoo Auctions and Mercari, then shows the median within the PSA 8 grade — not a single outlier sale — so the mark reflects the true market.