-If you're using choice band as Infernape, U-turn is kinda useless. If you're locked into a move because of the Choice item, you can't use it.
-Ice beam on an Adamant Sharpedo won't hit hard. Use either Ice Fang or make your other moves special and switch to Modest.
-Same as before, using Choice Specs on Altaria will prevent your from using Rest. You should remove the Choice Specs and swap them for something else, because Altaria really needs Rest to stay alive, with a great weakness to Ice.
-Flamethrower on Blissey will do nearly nothing because of Blissey's bad offensive stats. If you use Seismic Toss instead, you also have a way to break walls.
Other than that, your team seems fine. Good luck!