In Pokémon Crystal you can't evolve Magneton any further, because Magnezone was introduced with the IV gen games (Diamon and Pearl, Platinum).
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you might not be able to because magneton evolves at mount coronet and it has to evolve there so if you do not have platinum or diamond version then i think you should trade with a friend that has platinum or diamond version and ask them to evolve it and to show them your thanks you should evolve one of THEIR Pokemon to show your thanks. I hope this helped :D
If you can trade Pokemon from crystal version to gold version my guess is yes
In Pokemon Crystal Version, a Heracross will occasionally appear when you use headbutt on trees.
In Goldenrod city, but only in the Japenese version of Pokemon Crystal.
By trading one from gold/silver and cloning it Dani (the girl Pokemon trainer on Pokemon crystal version) By trading one from gold/silver and cloning it Dani (the girl Pokemon trainer on Pokemon crystal version)