Wait, you can send Legendaries to the Battle Subway this time around? I thought they were forbidden as they were in the Battle Frontier on both Johto and Hoenn.
My singles team is Garchomp (Perfect IVs on Speed and Attack, with an Adamant Nature and Sand Veil ability, 252 EV on Attack and Speed), Hydreigon (Perfect IVs on Sp. Attack and Speed, Modest Nature and Levitate ability, 252 EV on Sp. Attack and Speed) and Haxorus (Perfect IVs on Attack, Adamant Nature and Mold Breaker ability, 252 EV on Attack and Speed).
For my doubles, I usually add Salamence to those three (Perfect IV on Attack, Adamant Nature and Intimidate ability, 252 EV on Attack and Sp. Def).
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"