It doesn't evolve from level, you have to give it an item, the razor fang, I think, and level it up at night, any level.
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Give Gligar a Razor Claw and level it up at night.
You cannot evolve Gligar in Pokemon Ruby, Sapphire, or Emerald. It is unavailable. Only works on the newer games.
Gligar evolves into Gliscor when you give it a razor fang and level it up at night.
gligar will evolve when you gave a razor fang at night
at no level. You must level it up at night holding a razor fang.