Nidoqueen (F) @ Black Sludge
Ability: Sheer Force
EVs: 252 HP / 156 Def / 64 SpA / 36 Spe
Bold Nature
IVs: 0 Atk
- Earth Power
- Stealth Rock
- Sludge Wave
- Toxic Spikes / Ice Beam / Fire Blast
Nidoqueen has a minor niche in OU due to its wide movepool and decent combination of bulk / typing / damage output and ability to set up hazards. This set might seem a bit situational but 36 Speed EVs allow you to outspeed uninvested base 80's, 64 SpA gurantees you the OHKO on Koko (64 SpA Sheer Force Nidoqueen Sludge Wave vs. 32 HP / 0 SpD Tapu Koko: 290-344 (100.3 - 119%) -- guaranteed OHKO), which in return can only 4HKO you with HP Ice (172 SpA Tapu Koko Hidden Power Ice vs. 252 HP / 0 SpD Nidoqueen: 112-134 (29.1 - 34.8%) -- 99.9% chance to 4HKO after Black Sludge recovery), while having a chance to OHKO Mawile too (64 SpA Sheer Force Nidoqueen Earth Power vs. 92 HP / 0 SpD Mawile-Mega: 224-266 (84.8 - 100.7%) -- 12.5% chance to OHKO). The rest of the EVs are dumped in HP and Def to take on physical attacks better. The last move slot can vary depending on your team's needs.