Pokemon X competitive team help?

Looks to be a pretty solid team. You have an excellent movepool and a good diversity or special, physical and support moves. Good job!

I do see some flaws. Stealth Rocks are a necessity on almost every team, and looking at your team, you seem to have a big weakness to Stealth Rocks. Dragonite, Noivern and Arcanine will all lose 25% of their health upon switch in. If you're gonna run these three Poke's, you will probably need a Rapin Spinner or a Defogger.

Seeing as you do have Spikes on your Skarmory, you might like to get a Rapid Spinner. But if you don't wont to fit a Rapid Spinner on your team, then you can replace Spikes with Defog instead.

Also, you're packing some big threats on your team. But can you handle any other, ridiculously common threats? Do you have a plan for taking out Mega Kangas and Talonflames and Aegislashs? I guarantee you, you're likely to face at least one of them in every wifi battle. Make sure you've got a counter to these things!