A man gives them to you in Dark Cave. He's in the northwest corner of the Blackthorn City entrance.
Chat with our AI personalities
If you can trade Pokemon from crystal version to gold version my guess is yes
There is no official game yet, but there are rumors that there will be a Pokemon Gray version in a year or two, similar to Pokemon Platinum and Pokemon Crystal, as if it becomes real, it will be the third game in the Pokemon Black and White games.
In Pokemon Crystal Version, a Heracross will occasionally appear when you use headbutt on trees.
in any version you need a masterball
Yes, it can, but only if you have the gameboy version of crystal.