Staraptor for the job of finisher
Staraptor @ Life Orb
Ability: Reckless
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Giga Impact
- Quick Attack
- Brave Bird
- Close Combat/Endeavor
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The point here is sending him last (preferable), or in middle, landing the killing blow. Giga impact is the main move if he is sent out last and the enemy is not resistant against Normal type moves, if the enemy is already with low health, the choice is Quick Attack for the same reason as Giga Impact (Giga Impact for enemy with full or half health, Quick Attack for enemies with low health).
In case you have to enter in middle and not as the last one, you should make the most of Brave Bird, Close Combat/Endeavor, especially in cases where those moves would be more effective. (Endeavor can be very useful if you are facing enemies who are resistant against your offensive moves, especially if Staraptor is sent on middle and somehow manage to inflict heavy damage on you, the next Pokémon or your Quick Attack may be enough to faint your foe after this)
Of course in a situation where a Flying or Fighting move is more effective than a regular STAB from Normal move like Giga Impact, use the most effective move even if you are entering last. For example, if you are facing a Heracross, even if you are entering last, use Brave Bird (Or Quick Attack only if his health is already low).