So first off, I noticed some problems with your Celesteela. Assault Vest Celesteela is perfectly viable, but if you want to run that then you can't have Autotomize, because Assault Vest prevents the use of attacking moves. If you want to keep Autotomize, then I would suggest running Timid Nature and switching your EV spread to 252 SpA/252 Spe/4 Def, and getting rid of Assault Vest for Leftovers. However, the Celesteela I think would fit best on your team would be
Celesteela @ Leftovers
Ability: Beast Boost
Sassy Nature
EVs: 252 HP/252 SpD/4 Def
- Heavy Slam
- Flamethrower
- Leech Seed
- Protect
This Celesteela is extremely obnoxious to kill, and I feel fits better on your team as you don't have many tanks on your team.
Scizor's Return is a bit of a waste when they're better options like:
- Knock Off
- Pursuit
- U-Turn
- Quick Attack(?) OK this is a terrible idea but still better than Return!
For a Choice Banded Scizor, and considering your team as a whole, I would recommend Knock Off as it's a very niche utility move, and none of your pokemon currently have it. Unfortunately, it doesn't get a Technician boost, but it's well worth the price for what it offers. In addition, your EV spread on Scizor is missing 4 EVs. I would put those 4 EVs in Defense as it's Scizor's highest defense stat. (By "defense stat" i mean HP, Defense, and Special Defense.) It doesn't make a difference, but I just thought it was worth mentioning that putting 0 Special Attack IVs in all your physical attackers is pointless. People put 0 Attack EVs in special attackers because if they get confused, they would hit themselves for minimal damage (confusion damage is based on Attack). But, there is no such thing for special attackers, making 0 special attack EVs useless.
I don't see why you run Quiet Nature Magnezone even though you aren't running a.) a mixed set (thank god) b.) a Trick Room set. Switch it to Modest, please. Also, here's a more effective Magnezone set
Magnezone @ Choice Specs
Ability: Magnet Pull
Modest Nature
EVs: 252 SpA/180 Spe/76 HP
- Hidden Power (Fire)
- Thunderbolt
- Volt Switch
- Flash Cannon
Magnezone works best as a Steel Trapper, not a "Fast" Special Sweeper.
There's nothing inherently wrong with your Lucario, but I think you need priority moves on your team as Magnezone, Celesteela, Steelix-Mega, and Scizor aren't exactly Sonic the Hedgehog. Here's what I think to be a better fit on your team
Lucario @ Life Orb
Ability: Justified
Adamant Nature
EVs: 252 Spe/252 Atk/4 SpD
- Swords Dance
- Extreme Speed
- Close Combat
- Meteor Mash/Bullet Punch
Two priority moves on the same pokemon might seem like overkill, but if Bullet Punch is super effective, it will deal 160 base damage, way more than Extreme Speed's alright 80 base power. However, most of the time Extreme Speed is the much better choice (to use, not to put on your Lucario.)
So I think that's it for now and see you in the next RMT.^^