I beat Clay this morning! I have to say, it was the toughest part of my Electric Mono-Type Nuzlocke Challenge, but I managed to do it with a full team of Pokemon and while not losing any of them. Here is my updated team:
PkMn Trainer Fox
Pokemon 1: Level 36 Ampharos (Wooly) [Electric Type] (Male)
Gentle nature: Good endurance
Held Item: Quick Claw
Ability: Static (Contact with the Pokemon may cause paralysis)
Strength/Bulldoze/Fire Punch/ThunderPunch
Pokemon 2: Level 36 Magnezone (Sgt. Steel) [Electric/Steel Type] (Genderless)
Jolly nature: Hates to lose
Held Item: Shell Bell
Ability: Sturdy (It cannot be knocked out with one hit)
Mirror Shot/Flash/Volt Switch/SonicBoom
Pokemon 3: Level 36 Galvantula (Bugsy) [Electric/Bug Type] (Male)
Docile nature: Likes to fight
Held Item: Rocky Helmet
Ability: Unnerve (Makes the foe nervous and unable to eat berries)
Electro Ball/Signal Beam/Gastro Acid/Slash
Pokemon 4: Level 36 Jolteon (Jolt) [Electric Type] (Male)
Impish nature: Somewhat stubborn
Held Item: Expert Belt
Ability: Volt Absorb (Restores HP if hit by an Electric-type move)
Dig/Thunder Fang/Pin Missile/Thunder Wave
Pokemon 5: Level 36 Emolga (Squirrely) [Electric/Flying Type] (Female)
Docile nature: Often lost in thought
Held Item: BrightPowder
Ability: Static (Contact with the Pokemon may cause paralysis)
Volt Switch/Covet/Cut/Acrobatics
Pokemon 6: Level 36 Tynamo (Slimy) [Electric Type] (Male)
Sassy nature: Often dozes off
Held Item: None
Ability: Levitate (Gives full immunity to all Ground-type moves)
Tackle/Thunder Wave/Spark/Charge Beam
I was able to beat Clay due to various things. First the battle started out by him sending out his Krokorok, and I sent out my newly trained and evolved Galvantula. I OHKO'ed his Krokorok wth a powerful Signal Beam. After that he sent out his Sandslash, and I managed to keep dealing damage on it by switching between Pokemon I have after each of them take one or two hits and their health is in the red or orange, eventually leading to Sandslash to faint. Finally, he sent out his powerhouse, Excadrill, and I sent out my powerhouse, Ampharos. I got to attack first thanks to Quick Claw and Ampharos's speed and delivered a super effective Fire Punch, which made his health go down to orange. Then his Pokemon got healed with the Sitrus Berry, but not until after his health went down even more thanks to Excadrill getting burned. He proceeded to use Bulldoze, which left Ampharos in the orange. Ampharos got to attack first one more time and delivered the final Fire Punch, KO'ing his Excadrill and winning the battle. Geez, that was my toughest battle yet in the run, but at least I can relax knowing the next 3 gym battles won't be nearly as hard