Mewtwo-GX #78/73 is the Shining Legends secret printing often described as the laboratory or test-tube artwork. Do not pool it with full-art #72, rainbow #76 or the regular #39 Mewtwo-GX.
This guide covers Mewtwo-GX #78/73 in English, Secret Shining, Holofoil and PSA 10 only. Match the artwork, set and complete printed number before comparing a slab; raw cards, other languages and lower PSA grades do not support this estimate.
For a PSA 10 Mewtwo-GX purchase, inspect clear front and back slab photographs, the certification and holder condition. Check centering and visible foil marks without treating a price estimate as a guarantee of authenticity, seller reliability or future returns.
Exact card identification
Mewtwo-GX · Shining Legends · 2017 · 78/73 · English · Secret Shining · Holofoil · PSA 10. Other numbers, languages, finishes and grades are excluded.
PSA 10 estimated value
Saved Est. Value · PSA 10
Mewtwo-GX 78 · Shining Legends
$8,700
Saved sales: 2026-08-06–2026-10-30 (UTC). Historical evidence, not a live quote; opening this page does not refresh it.
16 sales in 30 days
The estimate is the median of the three latest qualifying completed Auction or Buy It Now PSA 10 sales within 90 days. Only retained exact-card transactions support the figure; asking prices and provider aggregates do not. The dated sample is not a live quote or a guarantee of future value.
Recent completed PSA 10 sales
Saved PSA 10 sales
Mewtwo-GX 78 · Shining Legends
- Oct 30, 2026eBay · Auction$8,700
- Oct 27, 2026eBay · Auction$9,000
- Oct 27, 2026eBay · Auction$7,954
- Oct 20, 2026eBay · Auction$8,225
- Oct 19, 2026Fanatics Collect · Auction$7,800
- Oct 17, 2026eBay · Buy It Now$8,900
PSA 10 sale history
PSA 10 price history
Mewtwo-GX 78 · Shining Legends
Saved sale-day averages · 2026-08-06–2026-10-30 (UTC). Not a live price feed. 46 sale days.
The chart uses the same qualifying saved transactions, grouped by sale day, rather than a complete census of market activity. eBay dates may have day precision; other sources may include timestamps. Population and investment-return claims are omitted because the evidence does not establish them.
Marketplace availability
No current listings for this card.
Before buying or selling
Compare the exact 78/73 printing with the slab label and seller photographs. Keep negotiation, payment and delivery decisions separate from this guide; an asking price is not a completed sale.