Cool team man!
So if you're running Scarf Magnezone, you're actually better off running Choice Scarf Magneton
. The Magnezone family is on of the few in the realm of Pokemon that actually loses speed when it evolves from Magneton to Magnezone. Your use of Magnezone as a Scarfer shows that speed is valued in the situation, and Magneton has a higher base speed. It has base 70 Speed instead of 60, which means it can outspeed Starmie and +1 Dragonite and +1 Gyarados.
I agree with Mr. Green's rate; the specially defensive spread he suggests for Skarmory helps take some pressure off of Gastrodon to wall Tornadus-T, who we all know is a top threat. It also helps it sponge special dragon-type attacks coming from the likes of Latios and Latias. While you do have Tyranitar for these threats a smart player can beat you 1 v 1 as you lack Crunch or any Atk EVs. Because of this the Lati@s player can stay in on Tyranitar and take the weak Pursuits, potentially setting up or KOing Tyranitar.
Gastrodon also desperately wants a Sassy Nature with Earthquake over Earth Power
solely for CM Jirachi. SubCM Jirachi in particular is gaining a lot of use in this metagame thanks to its astounding power in the Rain, the most common weather condition.
A final suggestion you could consider is trying Shed Shell on Tyranitar
. Dugtrio is so often found on opposing Weather teams and Tyranitar really is just a sitting duck waiting to be trapped. You do lose out on the only recovery Tyranitar has though, which would turn Lati@s into even bigger threats. But with Skarmory's new EV spread I believe this is worth it. Sandslash needs
the Sand up to be effective and if you lose Tyranitar you're pretty much also losing Sandslash.
@ Choice Scarf
Trait: Magnet Pull
EVs: 4 HP / 252 SAtk / 252 Spd
- Volt Switch
- Hidden Power [Fire]
- Flash Cannon