Counter: Reunclius
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Reuniclus @ Electrium Z / Fightinium Z
Ability: Magic Guard
EVs: 252 HP / 212 Def / 44 Spe
Bold Nature
IVs: 0 Atk
- Calm Mind
- Psyshock / Stored Power
- Recover
- Thunder / Focus Blast
Reuniclus has a lot of stuff going for it that makes it such a great ferrothorn counter, namely essentially an immunity to leech seed via it's ability magic guard, able tank it's hit well while staying healthy with recover and most importantly, ability to threaten sweeps via calm mind that's coupled with it's enermous bulk making it one of the most dangerous sweeper, and ferrothorn is one of it's biggest set up fodder
0 Atk Ferrothorn Power Whip vs. 252 HP / 212+ Def Reuniclus: 111-132 (26.1 - 31.1%) -- guaranteed 4HKO
+6 0 SpA Reuniclus Psyshock vs. 252 HP / 92 Def Ferrothorn: 153-180 (43.4 - 51.1%) -- guaranteed 3HKO after Leftovers recovery
+6 0 SpA Reuniclus Stored Power (260 BP) vs. 252 HP / 232+ SpD Ferrothorn: 445-524 (126.4 - 148.8%) -- guaranteed OHKO
+6 0 SpA Reuniclus Focus Blast vs. 252 HP / 232+ SpD Ferrothorn: 550-648 (156.2 - 184%) -- guaranteed OHKO