It should come as no shock (sorry for the pun) that Lt. Surge still favors Electric-types. As such, now would be an opportune moment to roll out your sturdy Ground-types.
Surge’s first Pokémon is Electrode. It can use Thunderbolt for STAB, Foul Play to damage high Attack Pokémon, Mirror Coat to retaliate against special attackers, and Explosion to blow itself up. Obviously, a Ground-type would be the perfect counter. If you’re afraid of Explosion, use Protect.
Next, Surge may bring out his Electabuzz. It can use Thunder Punch for STAB, Fire Punch to hurt Grass-types, Ice Punch to hurt Ground-types, and Brick Break to demolish any protective barriers. Despite Ice Punch, Ground-types are the superior choice.
Moving on, we’ve got Magneton. This one can use Thunder and Flash Cannon for STAB, Tri Attack to potentially inflict a status condition, and Hyper Beam for a sudden burst of damage. Because it’s also Steel, Ground-types will do considerable damage. Alternatively, go with Fire or Fighting if you want your Ground-type to take a break.
Jolteon is an Electric-type Eevee that boasts obscene Speed. It can use Thunder for STAB, Shadow Ball to deal neutral damage to most foes, Quick Attack to go first, and Reflect to weaken physical damage. Unless you’re using something like Dugtrio, there’s a good chance Jolteon will act before you do, so keep that in mind.
Finally, Lt. Surge has his favorite Raichu. It can now use Thunder Punch for STAB, Brick Break to break barriers, Iron Tail to hurt Rock-types, and Quick Attack to sneak in some damage before you do. So long as your Ground-type isn’t Rock as well, this should be a piece of cake.