You got it backwards mate, I'd go for a kings rock unless the opponent uses steadfast. By my battling standards, limitation before a strong offense secures most wins. And by god that strategy has worked for me all 7 years Ive played Pokemon. Luckily theres a lack of limitation moves in Pokemon, so its mostly offense for me 
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A 10% flinch chance over significant damage/recovery? Sounds like a Cloyster only item. Aren't you the guy who was dodging Talon's challenges? (I wonder if it stacks with serene grace)
(edit: it does)
Also @Talon, the reason I'd use Acrobatics + Flying Gem is because if you use LO you're stuck with 2 moves with recoil as well as LO damage and potential stealth rock, which really puts you on a timer. Given Talonflame's (pseudo?) priority and access to SD, I'd prefer to not have it knock itself out.
Speculation: Mega Latios is Dragon/Psychic with Adaptability
Stats: 80/110/80/180/110/140
Mega Latias is Dragon/Fairy with Multiscale
Stats: 80/80/110/110/180/140