Long time without working in my streak, but I have 147 wins in the Battle Subway Super Single and continues.
I was using Trick+SubChomp, I don't know if I will change for the next battles, but this one is working.
Annoying (Togekiss)@Choice Scarf
Modest, Serene Grace
Capitanazo (Latios)@Choice Specs
I abuse that some sets doesn't have more than 1 Pokemon to deal with Garchomp, trick and force the switch while I hide and boost Garchomp with Sub and SD. Against Ice trainers I just spam flinch or just launch Heat Wave/Aura Sphere in case is some fragile Ice-type.