I blame him not.
thowse GAWD DAYUM SAWK!
Multi-scale is a must, bro. Taking half damage from the first hit you take is essential for a defensive D-nite. I don't like the fact that you don't have roost on the set ('specially with all that EV investment in HP), but Multiscale is awesome even if you can only get a use out of it once. You definitely won't be gettin' a use out of Inner Focus every other match, that's for sure.
Speaking of Roost, I'd say throw it on over E-speed, whether you'll use Multiscale or not. It ain't like a neutral nature Dragonite with 126 Atk EVs is gonna hit hard with an 80 Base power move that's never super effective. That bulk needs to be capitalized on. The only excuse you have to run E-speed over Roost is if Latios scares your entire team shitless IMO. You should run damage calcs too, since I'm not even sure if a D-nite with such low Atk investments would 2HKO a full health 0/0 Latios, none the less a bulky Latias.
Also, lol @ Serious, simply 'cause I don't recall the last time I've seen anyone besides you runnin' neutral natures... It's just bloody weird to see. I can see why you're runnin' it here, 'course.
... Oh, and your EVs are wrong. 10 Spe means you've got a total of 514. :P