Flip a coin. If heads, this attack does 30 damage plus 10 more damage; if tails, this attack does 30 damage and Nidoking does 10 damage to itself.
20Toxic
The Defending Pokémon is now Poisoned. It now takes 20 Poison damage instead of 10 after each player's turn (even if it was already Poisoned).
“Uses its powerful tail in battle to smash, constrict, then break its prey's bones.”
How much is Nidoking #31/110 worth?
Right now (November 6, 2026) the going rate for an ungraded Nidoking #31/110 from Legendary Collection is about $15.55. Across the 2 printings we track, copies run anywhere from $9.00 to $166.99 depending on the version you're holding.
Grading changes the math on this one: a PSA 10 is valued around $398.37, roughly 25.6x the raw price, while a PSA 9 sits near $56.68. 979 copies have been graded to date, and 4% 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 Nidoking has moved over time.