I'm not replying to your thread because it'll probably soon be locked so you won't really be able to discuss it (belonged in Quick Questions or whatever the question thread is in that forum :P), but Air Slash is a special move, while Aerial Ace is a physical move. Braviary's Special Attack is abysmal, especially compared to his attack. Aerial Ace will be way more powerful on him than Air Slash, despite the power difference.