catch it
Find the crystal onix, make it weak and catch it with your best ball
In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.
You can only get an "onix" in Pokemon sapphire if you have a Pokemon version that has an onix then use a linking cable with other GBA to trade it and then you'll have an onix but "onix's" data can't be stored in your pokedex.NOTE:You can only trade with a Pokemon version that have the same region as your Sapphire has;HOENN REGION.
There is no such thing as a Crystal Onix. It only exist in the anime.
catch it
catch a onix 1000 times from first to last have no money have 99pokeballs, greatballs, ultreballs and 99max poitions
You can't you will have to trade from leaf green or fire red
You catch Onix in Orbeghuh Mines or on Iron Island
Find the crystal onix, make it weak and catch it with your best ball
In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.
to my knowledge,you cannot catch a dragonair in yellow version, but you can catch dratini in the safari zone
You can only get an "onix" in Pokemon sapphire if you have a Pokemon version that has an onix then use a linking cable with other GBA to trade it and then you'll have an onix but "onix's" data can't be stored in your pokedex.NOTE:You can only trade with a Pokemon version that have the same region as your Sapphire has;HOENN REGION.
Onix > trade w/ Metal Coat > Steelix
Onix is uncatchable in emerald you must get one from firered or leafgreen.
There is no such thing as a Crystal Onix. It only exist in the anime.
You can find psyducks at Seafoam Island