If you can trade in anyway, definitely get onix because steelix is better than golem. But if you cant trade, stick with graveler because it has better attacks and onix only has defense.
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Clamperl Dusclops Electabuzz Graveler Haunter Kadabra Machoke Magmar Onix Poliwhirl Porygon Porygon2 Rhydon Scyther Seadra Slowpoke Type your answer here...
Graveler does not evolve by a stone (or by a level). In order for Graveler to evolve, you have to trade Graveler over to another game.
If you mean,, what onix evolves into,, it's steelix,, but the is no Pokemon that evolves into onix
Poliwhirl, Kadabra, Machoke, Graveler, Slowpoke, Haunter, Onix, Rhydon, Seadra, Scyther, Electabuzz, Magmar, Porygon, Porygon2, Dusclops and Clamperl are all of the Pokémon who can evolve through trading with another game.
Graveler will only evolve when you trade it to someone.