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1. “Its body has been compressed deep under the ground. As a result, it is even harder than a diamond.”

   First printed on Neo Genesis #15 · 2000 · Illus. Ken Sugimori · on 2 cards

   • Neo Genesis #152000 · $52.61
   • Unleashed #242010 · $3.84

2. “If an Onix lives 100 years or more, its skin hardens, eventually becoming even harder than a diamond.”

   First printed on Neo Destiny #112 · 2002 · Illus. Ken Sugimori

   • Neo Destiny #1122002 · $562.50

3. “Tempered underground under high pressure and heat, its body is harder than any metal.”

   First printed on Diamond & Pearl #38 · 2007 · Illus. Kouki Saitou · on 5 cards

   • Diamond & Pearl #382007 · $4.47
   • Stormfront #282008 · $3.90
   • Unified Minds #1042019 · $0.41
   • Cosmic Eclipse #1392019 · $0.77
   • Cosmic Eclipse #2472019 · $18.96

4. “The iron it ingested with the soil it swallowed transformed its body and made it harder than diamonds.”

   First printed on Plasma Freeze #79 · 2013 · Illus. 5ban Graphics

   • Plasma Freeze #792013 · $3.94

5. “It chews its way through boulders with its sturdy jaws. Its eyes can see in the darkness underground.”

   First printed on Celestial Storm #89 · 2018 · Illus. Ken Sugimori · on 2 cards

   • Celestial Storm #892018 · $3.07
   • Lost Thunder #1252018 · $0.48

6. “It is thought its body transformed as a result of iron accumulating internally from swallowing soil.”

   First printed on Battle Styles #99 · 2021 · Illus. NC Empire · on 4 cards

   • Battle Styles #992021 · $0.41
   • Fusion Strike #1392021 · $0.29
   • Paradox Rift #1252023 · $0.21
   • Paradox Rift #2082023 · $36.87

7. “It is said that if an Onix lives for over 100 years, its composition changes to become diamond-like.”

   First printed on Pokémon GO #044 · 2022 · Illus. GOSSAN · on 2 cards

   • Pokémon GO #0442022 · $0.16
   • Lost Origin #1242022 · $1.15

Every quote above is printed on the card it links to. Card text and images © their respective owners.