I would make all the sucky guys (Flareon, Farfetched, Banette, etc) better. I would improve Empoleon and the Regis for more special walls, and I would add Rapid Spinners. Boost Poison, weaken Steel. I'll edit in more later.
I was thinking about the uses of Choice Scarf, and got over to a Scarf set. May I introduce...Scarfturne!
Cacturne@ Choice Scarf
Ability: Sand Veil
Evs: 6 HP/252 Atk./252 Spd.
Adamant Nature (+Atk. -SpAtk.)
- Seed Bomb
- Brick Break
- Return/Thunder Punch
- Faint Attack/Sucker Punch/Thunder...
Question: I may be wrong, but I thought our poke's name was Syclant. However, people are saying Scylant. It may be a minor difference, or a spelling mistake, but I'm curious.
EDIT: Tail Glow might work, might not. You should test it first before deciding