Relicanth @
Wacan Berry
Ability: Rock Head
EVs: 84 HP / 252 Atk / 20 SpD / 152 Spe
Adamant Nature
- Rock Polish
- Waterfall
- Head Smash
- Earthquake
Relicanth has an unfortunately low Special Defense stat; however, it has just enough to pull off a Wacan Berry set. Thunderbolts from common electric-types in PU do about 60% on average with Wacan, which gives you a nice opportunity to set up a rock polish. From there, you can tear through offense with the combination of Head Smash, Waterfall, and Earthquake. Earthquake is here to have a way to consistently OHKO the electrics you set up on, as it is more reliable than Head Smash. Here are some defensive calcs:
252 SpA Life Orb
Zebstrika Thunderbolt vs. 84 HP / 20 SpD Wacan Berry Relicanth: 191-226 (52.7 - 62.4%) -- guaranteed 2HKO
252+ SpA Life Orb
Electrode Thunderbolt vs. 84 HP / 20 SpD Wacan Berry Relicanth: 208-247 (57.4 - 68.2%) -- guaranteed 2HKO
252 SpA Life Orb
Raichu Thunderbolt vs. 84 HP / 20 SpD Wacan Berry Relicanth: 207-243 (57.1 - 67.1%) -- guaranteed 2HKO
252+ SpA Choice Specs
Ampharos Thunderbolt vs. 84 HP / 20 SpD Wacan Berry Relicanth: 306-361 (84.5 - 99.7%) -- guaranteed 2HKO
And Earthquake OHKOes all of these mons with Stealth Rocks up (except Ampharos, which is bulky af.)
However, something to take note of is that all of these mons can OHKO with some form of coverage (Raichu's Focus Blast, Zebstrika's/Electrode's Hidden Power Grass.)
Luckily, the PU ladder isn't so cancerous that people will try to style on you by landing all of their inaccurate moves, and HP Grass isn't that common with HP Ice being so popular. You also have to weaken bulky Grass-types like Tangela as well, but that's true of any Relicanth set.
In summary, this is a nice little Relicanth that sets up on the electric-types you would think would force it out.