You have to first get a Gligar on Route 45, and then level it up at night (after it gets dark in the game - usually after 8 PM of its internal time), with held item being Razor Fang.
Source: Bulbapedia.
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You don't Gliscor in Pokemon Gold. Gliscor only appears in Pokemon Diamond/Pearl/Platinum/Heartgold/Soulsilver or generation 4.
Gliscor is ground and flying, I think
you could get a gligar but not a wild gliscor
~Here are some ways to get a Gliscor 1. Go to Poke Transfer to transfer an old Gliscor 2. Transfer a Gligar through Poke transfer 3. Go to GTS and Deposit a Pokemon to get one or Find a wild Gliscor in Pokemon black and white ===================THATS ALL I CAN HELP TY===================
, Growlithe, Arcanine, Omanyte, Omastar, , Ariados, Gligar, Mantine, , Sableye, Baltoy, Claydol, Anorith, Armaldo, Kyogre, Mantyke and Gliscor are all exclusive to Heart Gold.