Fissure will not hit flying type Pokemon as it is a ground type move, by that same token it will not hit Pokemon with the ability levitate.
Guillotine and Horn Drill will not hit ghost type Pokemon as they are a normal type move.
So Fissure can hit Ghost types, just not those with levitate, and Guillotine and Horn Drill can hit Flying types.
Still, given the chances of actually hitting with these one hit KO-moves, and the ability sturdy, you'd probably be better off just using Crunch or Thunderbolt.
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Flying type Pokemon are good against normal Pokemon.
Find a Flying-type Pokemon and catch it. There are plenty of them in each game and many Flying-type Pokemon are common Pokemon, so you shouldn't have trouble doing so.
The weakness of flying type Pokemon is Ice, Electric and Rock.
The LARGEST Flying Pokemon is RAYQUAZA at 23' (7m) in length.
with a flying pokeball