Flygon doesn't naturally learn either of those moves.
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Flygon can only be taught Outrage through a Move Tutor.
You have to anal probe it 3 times, then it learns outrage.
Flygon can learn many useful moves like Earthquake, Dragon Claw, Outrage, Draco Meteor, Fire Punch, Flamethrower, Fire Blast, Rock Slide, Stone Edge, and U-Turn.
Garchomp can only learn Outrage if you breed it.
With a TM.