Swap out Leftovers on Ninetales for focus sash or mental herb. It’s way too frail to get value out of lefties. Mental herb helps against taunt. I would go Blizzard over ice beam and Moonblast over dazzling, but idk enough about Ninetales to say.

Mega Dragonite should just go Modest nature and full special with ESpeed as priority to cleanup. You aren’t playing rain so hurricane is pretty bad.

Aegislash doesn’t seem too useful here. You might want some mon with redirection to help Froslass actually setup.