You can find it in the Pinwheel Forest Hidden Grotto.
Other places/ways to get it are: Dream World Rugged Mountain, trading, migrating.
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Literally anywhere you see water. Use a fishing rod to catch one. There all over the place! XD -Chii
It doesn't exist in Pokemon Pearl as it was introduced in fifth gen
fire red cheats do not work on Pokemon shiny gold
Pokemon shiny gold can be only be played on the computer
You cant obtain him in the game. Either you can trade a bagon or shelgon from another game and evolve it in heart gold. I dont know what level it evolves at but someone else should be able to tell you what level it evolves at.