Well....tough one.
Let’s see the Pros and Cons:
Marowak:
Pros
-Access to has a duper high atk stat of 160 withought any conséquence with Thick Club
- Rare wallbreaker typing
- Strong ability of Lightning rod makes it immune to electric type and Rock head makes it loose all the recoil from the Stab Flare Blitz
-Good pyschical def. stat of 110
-Movepool wasn’t bad
Cons
-Speed of 45 ain’t give it a chance to outspeed the other sweeper, which’s a big problem
-Rock head was hard to obtain in-game seems it’s a hidden ability (of course this doesn’t matter you seems ur playing showdown.)
-Could received a lot of damage by a lot of other super-effective attacks.
252+ Atk Mandibuzz Foul Play vs. 0 HP / 0 Def Marowak-Alola: 228-270 (87.3 - 103.4%) -- 18.8% chance to OHKO
Magnezone:
Pros:
-Extremly high SpAtk
-Good defensive typing
-Magnet Pull was awful nice
-Could OHKO a lot of tanks such as toxapex:
252+ SpA Choice Specs Magnezone Thunderbolt vs. 252 HP / 4 SpD Toxapex: 356-422 (117.1 - 138.8%) -- guaranteed OHKO
Cons
-Typing receive 4x damage from ground type attacks
-Speed isn’t that good, which need a scarf if you want to outspeed other offensive sweepers in OU
So at last, I have to say Manezone was the winner due to it could type more hits and immune from the Toxic stallers such as Blissy and Eviolate Chansey and had more advantage on wall breaker, although Alolan Marowak was also good.
If you want a Psychical, go with Marowak
If you wants a Special, go with Magnezone
Moveset Suggestion:
Magnezone @ Choice Specs
Ability: Analytic
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
- Thunderbolt
- Flash Cannon
- Volt Switch
- Steel Beam / Toxic
Marowak-Alola @ Thick Club
Ability: Rock Head
EVs: 196 HP / 252 Atk / 60 Spe
Adamant Nature
- Earthquake
- Flare Blitz
- Low Kick / Sword Dance
- Poltergeist
Hope it helps!
