When you play Gyarados from your hand to evolve your Active Pokémon, you may flip 2 coins. For each heads, discard an Energy card attached to the Defending Pokémon.
Attacks
50Dragon's Vengeance
If Gyarados has 7 or more damage counters on it, this attack's base damage is 100.
How much is Gyarados #H10/144 worth?
Right now (November 5, 2026) the going rate for an ungraded Gyarados #H10/144 from Skyridge is about $1,249.94.
Grading changes the math on this one: a PSA 10 is valued around $14,250.00, roughly 11.4x the raw price, while a PSA 9 sits near $5,720.85. 1,158 copies have been graded to date, and 12% of them came back a 10 — worth knowing before you pay grading fees.
We update this valuation every night from live market data and verify it against real completed sales — see the chart above for how Gyarados has moved over time.