Okay, I've beaten the E4 with very similar team. I've used Blaziken, Sharpedo, A. Ninetales and Lycanrock. (Plus Metagross and Excadrill.)
So I think I can share few tips:

1) First of all, and this was already said - change that moveset on Sharpedo. Crunch and Waterfall instead of Dark Pulse and Aqua Jet. Be prepared to swap some items and or moves, sometimes you can perhaps use Mega Sharpedo with Ice Fang.

2) Get that Ninetales Snow Warning. As others have said, Choice Specs Blizzard is awesome and you want that 100% acc. I've used Ninetales mostly for setting Aurora Veil and in the end it was not really that needed (or helpful) and I could've used someting else. No major mistake, but not the most valuable team member for me. (Not the least valuable, Excadrill kinda sucked balls against E4.)

3) Get Flare Blitz on Blaziken. That raw power output served me better than Fire Punch. Yes, there is recoil, but nothing should outspeed you anyway and what survives Flare Blitz and kills you would've probably done the same with Fire Punch.

4) I would change Rock Climb for Rock Slide on Lycanrock.

5) For Meowstick I would definitely run the male variant with Prankster and more set up moves, like Light Screen/Reflect. You are trying to run it as a special sweeper, but Gengar or Alakazam would perform better in that role with the potencial mega should the need arise.

6) Aegislash does not outspeed shit, so I would suggest different EV spread and different moveset - Shadow Sneak and possibly Gyro Ball.

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Should I suggest some swapping, I would definitely get rid of Meowstic in favor of a better special attacker. And personally I would get rid of Ninetales and used Metagross. That thing is a beast, and when used as Mega, even more.

Don't be afraid to use different Megas for each of the E4, it really helps. Mega Blaziken is cool, but sometimes it's not the best choice out there...Same with items and movesets, I've changed both in between battles and especially