At rock cave
ptdgames
Pokemon Tower Defense is 1st generation pokemon only, so no fourth generation or second generation evolutions (including Steelix). Therefore, Onix can't evolve.
beat it with a pokemon that has the advantage
In the cave place. I think it is lvl 3.
well the only one i know of is one you can make. onix to steelix
you beat the giant onix and show a guy a pikachu lv 42 and a electrod and you will get a shiny voltrob
catch it
Nothing.
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 only get it by trading from rife red. :)