Better Magnezone setup?

[DecShep]

I'm having trouble deciding which is a better setup for Magnezone. I fully understand if this is dumb af, I never was a competitive player so please don't judge me too harshly.

 

A Magnezone set I used in XY (story mode though) that I really liked was: Modest/Analytic/ EVs in HP and SAtk/Assault Vest

I like this because, the way I see it (could be wrong feel free to correct me) this gives it all around tankiness plus power. Naturally high Def, SDef boosted Assault Vest and EVs in HP. And with no spd investment, it should go last to do massive damage with an analytic boost

 

But for all I know, thats a horrible spread, and I've also heard Sturdy is a great ability in game, which I agree with as my Donphan and later Golem have helped me immensely. But Magnezone is pretty tanky anyway, so I can't imagine Sturdy being necessary, plus its a one time usefulness, whereas Analytic will always boost as long as it goes last. However, with the Assault Vest, I'm prevented from using Ele-Terrain which I've heard reeeeally helps control field effects.

 

Also, since I'm here anyway. Which should I battle Amaria in? Double or Single? My team is: Magnezone, Mega Ampharos, Gardevoir, Sceptile, Roserade, and either Metagross/Scrafty (with Thunder Punch) or Escavalier (just super powerful and tanky and already low speed so field isnt a big deal)

[Mimikyu]

Smogon Builds- [As current to SwSh OU Meta]
 

Spoiler

Thunderbolt/Flash Cannon/Volt Switch/[Toxic-Body Press]
Choice Specs

Analytic
Modest
4 Def / 252 SpAtk / 252 Spd

 

Spoiler

Iron Defence / Flash Cannon / Volt Switch / Toxic-Body Press
Air Balloon/Grassy Seed/ Chople Berry
Magnet Pull
Bold
252 Def / 116 SpAtk / 140 Spd