Where's Greed in your team? :O
Anyways, 4 Choice items seems too much. 2 is fairly enough - Scarf for Revenge killing and Band (U-Turning).
-Latios concerns me. I wonder why you've put 252 in the SPD. Invest those EVs in SPE.
-Rotom-H is fine I guess. Though I don't have much knowledge about the UU tier.
-Scizor is perfect. Team also seems balanced for him to switch out on a Pokemon.
-Genesect again I don't know why the investment is SPD. Maybe trying to survive strong SPA moves such as Flamethrower, Fire Blast or something?
That's all I can really think as of now.