@Choice Specs/LO (Choice Scarf)
Ability: Electric Surge
EVs: 4 HP/252 SAtk/252Spd
Timid
-Discharge
-Dazzling Gleam
-Grass Knot
-HP Ground/Water...
@ Focus sash
Ability: Lightningrod
EVs: 4 HP/252 SAtk/252Spd
Timid
-Fake Out
-Discharge
-Surf
-HP Ice (Grass Knot)
@ Life-Orb
Ability: Sheer Force
EVs: 4 HP/252SAtk/252Spd
Timid
-Earthpower
-Sludgebomb
-HP Ice/...
-Protect
@ Leftovers
Ability: Beast Boost
EVs: 252 HP/Def/SDef/4Spd
(nature depends on the final set)
-Leech Seed
-Heavy Slam/Flamethrower (Earthquake)
-Wide Guard
-Protect
Changes:
The only difference is the change from Sceptile to Landorus. I think it is important to switch one lead out while the other can still use Discharge. Sceptile cant come in because it has to mega-evolve first to get its Immunity. Also this team is a bit weak to Fire (-> Threat List).
There arent many Pokemon with both Ground and Electric Immunity. I think the best choice for this team is Landorus. Great power, some bulk, few weaknesses, adequate speed. It needs to be a special set for the Ground STAB, since Earthquake shouldnt work too well in this team. Sludgebomb is a nice coverage move to Earthpower - only very few Mons resist both, and many of them are hit super effecitive by HP Ice. atsync used the same Landorus with similar leads.
Threat List:
Ground Types:
Most obvious threat. Actually i think they are not too dangerous since many of them have two times weaknesses to Surf/Grassknot/Ice... Also the backrow is immune to Ground, and can take some other hits as well as kill them fast (Lando) or stall them down (Steela). I think this Duo can easily take out many Mono-Type Ground teams.
Lightningrod/Voltabsorb:
Immune to the main attacks of my leads, but they cant hurt me much, too. Kokos HP Ground helps.
Fire Types:
This team has one Fire Weakness, but no resistance. There are some Fire Mons that dont go down quickly, but can deal huge amounts of Damage with STAB-FlareBlitz etc. My leads can do some damage of course, and Landorus (who has a really nice Speed, slightly outspeeding for instance Charizard (X/Y), Typhlosion, Entei, Ninetales, Mega-Blaziken (before Speed Boost), Volcarona.) can KO many of them with Sheer Force STAB LO Earthpower.
Scarfer:
Some Scarfer are really dangerous to this team. Garchomp sadly cant be KOed by Dazzling Gleam + Fake Out. Darmanitan also is super dangerous; only Lando survives non-crit Flareblitz savely.
Eruption Spam also can be unconvenient (as Fire Mons in general are) if it appears in the wrong situations. In turn one i can Fake Out + Discharge, reducing the damage. In other situations i might lose my leads since i cant switch Lando/Steela in. Once they are in, i can use Wide Guard/Earthpower.
As always with Scarfer one needs to play smartly around.
Alolan Marowak:
He gets a special mention. Only Landorus can OHKO him, but my whole team is a OHKO to Flareblitz. Thats one reason to play Koko with HP Ground: Together with Raichus Surf they also can kill Marowak.
I guess once this team is played, some other threats will make it on that list.