Couple of things I want to point out before getting into my set. First of all, Flygon has access to Dragon Rush now, which makes it an option at least for a Hone Claws set
Ranger Helmut. I love offensive Defog Flygon. Anyway, I'm going to take a spin on Flygon's Scarf set:
Flygon @ Choice Scarf
Ability: Levitate
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Outrage
- Earthquake
- U-turn
- Tailwind
So the first three moves are pretty basic standard fare for Scarf Flygon. That said, a lot of people choose Defog or Fire Punch as Scarfgon's final move. While both have their uses, a late-game Tailwind can be absolutely brutal. Double Speed for 3 turns is often all a slower attacker needs late-game to finish a match. That Life Orb Meloetta you thought you had a revenge killer for? It finishes you off instead. It's great that you saved a faster mon to pick off Hitmonlee. Too bad Hitmonlee now outspeeds everything. You get the idea. Any quick, but not fast, attacker is going to be doing loads more damage late-game after a Tailwind. Stuff like Lee, Melo, Doom, Gallade, Exploud, etc. can easily ravage teams late-game after Flygon uses a Tailwind. Adamant is the preferred nature for the power boost, but if your team is weak to Scarf Lee, you may want to opt for Jolly so you can knock it out before being met by a HJK to your face.