Yes u can catch onix in pearl. hes at stark mountain and in jubilife city just keep on going forward into the cave and he should be in there too.
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Find the crystal onix, make it weak and catch it with your best ball
Onix doesn't evolve at a level. You have to give it the item 'Steel Coat' and trade it to make it evolve into Steelix. Or just catch a steelix at Victory Road using dusk balls
catch it
There is no such thing as a Crystal Onix. It only exist in the anime.
He only appears in the anime. You cannot catch him in any game.