Pokémon — Episode 33: Fighting Fear with Fear!

You are watching the episode Fighting Fear with Fear! Ash continues his training with Gligar, but finds out it has become fearful of battles since the battle against Paul's Gliscor. The group meets Gary again, and Ash asks Gary to help him solve the problem with Gligar, and Gary gives Ash a Razor Fang, which makes Gligar evolve into Gliscor.