So I plan on doing some casual battles in between settling on a team for some more serious stuff.

I'm going to use this team:
>Galvantula lead
>Scizor (with megastone)
>Malamar
>Arcanine
>Mewtwo (with mega stone)
>Sylveon or Xerneas
Inkay has a trickroom setup with contrarion and superpower.
All with 5 IVs (except for the legendaries) where they should be and IV trained. The only exception is malamar which I made sure is really slow.

How badly will the typical Megablaziken/aegislash teams fuck me up?