Some sets I'm keen to try (no idea how good they'll be)
Scizor @ Life Orb
Ability: Technician
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Swords Dance
- Bullet Punch
- Double Hit
- Superpower
Factoring in STAB, Infestate and Technician, Double Hit has 100 power per hit! Calcs:
+2 252+ Atk Life Orb Technician Scizor Double Hit (2 hits) vs. 252 HP / 144+ Def Hippowdon: 440-518 (104.7 - 123.3%) -- guaranteed OHKO
+2 252+ Atk Life Orb Technician Scizor Double Hit (2 hits) vs. 252 HP / 88+ Def Ferrothorn: 416-494 (118.1 - 140.3%) -- guaranteed OHKO
+2 252+ Atk Life Orb Technician Scizor Double Hit (2 hits) vs. 4 HP / 252+ Def Eviolite Chansey: 830-978 (129.2 - 152.3%) -- guaranteed OHKO
It's inaccurate, unfortunately, but fairly powerful. I'd sooner go Shiny for the Steel typing, personally, even considering the redundancy with Bullet Punch. Bug is just not a good attacking type, and it's not even complimentary with Steel.
Seven types resist Bug, where only four resist Steel, and Electric is not noted for its walls, so unless you've got specific targets in mind (Such as Ferrothorn, admittedly) Steel will often be the better typing. Among other points, being only singly resisted by Skarmory is quite nice.
Azumarill @ Choice Band
Ability: Huge Power
EVs: 252 HP / 252 Atk / 4 Spe
Adamant Nature
- Double-Edge
- Aqua Jet
- Play Rough
- Superpower / Knock Off
Standard Band Azumarill, but now with a STAB with almost twice the power of Waterfall. You could also run shiny if you want Double-Edge to be Fairy type.
I'm not sure why you'd want your Azumarill killing itself on every attack for a less than 20% increase in power over Return/Frustration. Are there any particular targets it passes a critical threshold on?
A different angle would be to run Body Slam. It's still a substantial increase in firepower over Waterfall (Or Play Rough if Shiny) while spreading Paralysis, making Azumarill more than just a wallbreaker/item remover.
Heatran @ Choice Scarf
Ability: Flash Fire
Shiny: Yes
EVs: 28 HP / 252 SpA / 224 Spe
Timid Nature
- Overheat / Fire Blast
- Nature Power
- Earth Power
- Hidden Power Ice
With Nature Power, Heatran now has a reliable Steel STAB which also has a 30% chance to cause status.
... it already has a reliable Steel STAB? Flash Cannon. Spreading Status is good, of course, but it wasn't
lacking a Special Steel STAB.
An alternative would be Uproar. I mean, you
are already choice-locked by the Scarf, though admittedly Uproar also traps you.