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You can find an Onix in Dark Cave or in Victory Road in the main game.

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Q: Where do you find onix in Pokemon HeartGold?
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Related questions

How do you get Onix in Pokemon HeartGold?

in caves

What Pokemon are on victory road in Pokemon HeartGold?

graveler, rhyhorn, onix, donphan and i think golbat

How does Onix Evolve in Pokemon SoulSilver and HeartGold?

You must Trade Onix while it is holding a Metal Coat in order to Evolve into a Steelix.

When does onix evolove on Pokemon HeartGold?

onix dose not evolve!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! (quote of above comment) yes it does it evolves into steelix! onix evolves after trade holding metal cover

Where do you get Onix in Pokemon HeartGold?

get a bellsprout and trade with a school kid in a house in violet city

When does onix evolve in Pokemon HeartGold?

You need to give it metal coat and trade to evolve it to Steelix.

Where do you find a crystal Onix in Pokemon soul silver?

There is no such thing as a Crystal Onix in the Pokemon games series. It was only in the Pokemon anime.

Where do you find onix in Pokemon black?

relic castle

Where to find a onix in Pokemon LeafGreen?

rock tunnel

How do you get a steelix in Pokemon HeartGold?

Get an onix have it hold the item metal coat then trade it to someone then take it back it will be a steelix now.You catch an onix then trade it while it's holding metal coat.

Where can you find an onix in Pokemon FireRed?

Onix can be found on seven island, six island and rock tunnel.

Where do you find a onix Pokemon diamond?

You find it in Orbegugh Mnes or on Iron Island