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This will give you all it's locations and encounter percentages: http://www.psypokes.com/dex/pokedex.php?id=116&view=location
I believe that there is a 2 in 10 chance of finding one in LG if you're using a good rod and searching in the correct places.
Hope it helps. Good luck on your search.
Ususally bug, fighting, rock and ghost Pokemon aren't in my team. Sometimes I train up some of those Pokemon for a bit of fun. However, I do have an EVIL Gengar on my Fire red main team.