Bugsy's Scyther appeared in the gym battle against Ash's Pikachu and Cyndaquil at the Azalea Gym. Scyther was Bugsey's strongest Pokemon and easily defeated Ash's Pikachu. Against Cyndaquil, Scyther used Swords Dance to raise its attack power and deflect Cyndaquil's Flamethrowers at the same time. Eventually however, Ash ordered Cyndaquil to get above Scyther and use a Flamethrower straight down at it. Scyther took severe damage from the unexpected technique and Cyndaquil finished it with a Tackle attack.
Edit