In Pokémon Tower Defense, you can catch an Onix in the Rock Tunnel area. This location is accessible after progressing through the game, specifically around the Kanto region. You may need to defeat certain trainers and navigate through the tunnel to encounter Onix. Make sure to check for any specific requirements or conditions to increase your chances of catching it.
ptdgames
At rock cave
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. :)