I don't think AV is a great item on Tyranitar. Choice Scarf, Choice Band, and Smooth Rock are all generally better options. You could even replace Tyranitar or Hippowdon with something else as they have similar weaknesses and you don't really need 2 sand setters, IMO.
Also Safety Goggles is probably a poor choice of an item in general, especially for Rotom. You will find leftovers much more beneficial on this mon.
The rest of your mons seem fine. I think Celesteela is better with Leftovers and a more defensive set, but a specially offensive one could work I suppose.
Thanks for your input! I really appreciate it. I was thinking defensive swords dance scizor. Here's the set
Scizor-Mega @ Scizorite
Ability: Technician
EVs: 248 HP / 160 Def / 80 SpD / 20 Spe
Impish Nature
- U-turn
- Swords Dance / defog
- Bullet Punch
- Roost
I think that's a good replacement for hippo. Please let me know what you think! Thanks again.