Zekrom got some really nice buffs this generation. The metagame has shifted in its favor in comparison to many other Dragons, mainly due to the fact that its strongest attack isn't coming from that Dragon STAB. I would personally don't use scarf, though, since it gets stuck when building momentum with Volt Switch against the infinite amount of Groudon+Xerneas sun teams on the ladder (or any Ground-type+Xerneas for that matter). Outrunning MMY is quite irrelevant, since it's not that much of a threat and BU mmx is a bit of a pain for scarf Zek anyway. I'd personally use a mixed Zekrom to lure in Groudon and pave way for a MMX (is phazed by D tail Groudon as a rare as it is), Mega Lucario or E-killer sweep. Additionally we shouldn't forget that it gets Tailwind and Roost, two great moves to make it able to stand up longer, and coupled with the Thunder Wave immunity it has now it completely runs over Lugia too. Speaking of paralysis, ladder is full of T-wave spam, another reason to justify the usage of Zekrom at least on the ladder. Finally, here is a set I have been tinkering with:
Zekrom @ Life Orb
Ability: Teravolt
EVs: 252 Atk / 80 SAtk / 176 Spd
Naughty Nature
- Bolt Strike
- Draco Meteor
- Tailwind
-(filler slot, can be fit to team's needs)Outrage / Roost / idk Toxic is fucking good as always to screw up Arceus-Ground/Grass etc
The EVs may be changed accordingly, atm I'm running enough speed to be faster than scarf Terrakion in Tailwind, which might be irrelevant but Draco 2HKOs support Groudon at least so there isn't really any need for more special attack I guess.