Dunno if this technically counts, but...

Mantine @ Heavy-Duty Boots
Ability: Water Absorb
EVs: 252 HP / 136 Def / 120 SpD
Calm Nature
IVs: 0 Atk
- Scald
- Mirror Coat
- Roost
- Defog
Rotom-Wash can generally come in safely against Mantine and do some free damage to it with Volt Switch, but not this time. This Mantine's EVed so that Mirror Coating the Volt Switch does enough damage to KO a fully invested base 100 HP mon (Tang, Mew etc.) Anything with more HP than that bar Chansey, Gastro and Rhyp get outright KOed after damage from rocks. Just need to scout for a Toxic or Choice Scarf before deploying this strat.
0 SpA Rotom-Wash Volt Switch vs. 248 HP / 120+ SpD Mantine: 204-240 (54.6 - 64.3%) -- guaranteed 2HKO
Possible damage amounts: (204, 204, 204, 208, 208, 216, 216, 216, 220, 220, 228, 228, 228, 232, 232, 240)
Mantine @ Heavy-Duty Boots
Ability: Water Absorb
EVs: 252 HP / 136 Def / 120 SpD
Calm Nature
IVs: 0 Atk
- Scald
- Mirror Coat
- Roost
- Defog
Rotom-Wash can generally come in safely against Mantine and do some free damage to it with Volt Switch, but not this time. This Mantine's EVed so that Mirror Coating the Volt Switch does enough damage to KO a fully invested base 100 HP mon (Tang, Mew etc.) Anything with more HP than that bar Chansey, Gastro and Rhyp get outright KOed after damage from rocks. Just need to scout for a Toxic or Choice Scarf before deploying this strat.
0 SpA Rotom-Wash Volt Switch vs. 248 HP / 120+ SpD Mantine: 204-240 (54.6 - 64.3%) -- guaranteed 2HKO
Possible damage amounts: (204, 204, 204, 208, 208, 216, 216, 216, 220, 220, 228, 228, 228, 232, 232, 240)












but this also works well as a lure. Rotom-W is a pretty safe answer to steela's two main sets. It can just volt on the defensive set and wear it down while offensive variants can only damage it with the unreliable meteor beam since it resists air slash and flamethrower. Therefore, its going to be switching into steela a lot during a game. Specs energy Ball is able to OHKO after rocks damage, removing rotom from the game. The other moves are STABs and coverage for steela's usual targets















