A gold geodude is just a shiny geodude you must keep finding geodude in granite cave until its shiny.
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Granite cave.
You can find one in granite cave.
In emerald, rock slide can't be obtained. But it ca be learned by rock - type Pokemons such as Geodude. Maybe there's a TM, or cheat to buy one.
Anywhere you can find geodudes, but they are extremily rare.
you get a golden and train it to level 34