There's really only 2 sets for this Pokemon to use, and its only really used in NU. You have the sweeper role, which is disgustingly outclassed by birds like Braviary or Swellow, or you have the support role, which is unique to Unfezant.
Unfezant @ Choice Scarf / Life Orb
Ability: Super Luck
EVs: 252 Atk / 4 Def / 252 Spd
- Pluck / Aerial Ace / Night Slash
- Roost / Night Slash
Yeah, this is kind of a sweeper role. Unfezant is slower than Swellow and much weaker than Braviary and its movepool is way weaker than the both of them. At least you get U-turn and a STAB Frustration (use 0 happiness), Pluck or Aerial Ace, they hit just as hard but each do something unique, but not exactly relevant to the meta. Night Slash is fun with Super Luck as you get to see everyone cry about they were crit haxed. Roost is just for healing between SR and what have you.
Unfezant @ Leftovers
Trait: Super Luck
EVs: 248 HP / 8 Atk / 252 Spd
This is a fast support role, which the other birds don't pull off so well. Its still not worth a spot on the team, but it works for Unfezant. Everything should make sense. Just be careful with Hypnosis.
And I gues if you're playing ingame, I guess none of this matters so just go with Sharp Beak or Sky Plate, Those are usually good ingame items.