Return/Frustration is pretty busted as a item choice, boosting lower power moves to base 102. This can be extremely powerful with priority or boosting moves such as Power-Up Punch but also increasing the power of coverage moves such the elemental punches and Hidden Power etc.
Conkeldurr @ Return
Ability: Iron Fist
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Power-Up Punch
- Ice Punch
- Thunder Punch/Drain Punch
- Mach Punch
Conkeldurr's Power-Up Punch and Mach Punch become a whooping base 122 STAB option (if Iron Fist works the way I think it does, which I'm pretty sure it is considering I did like 46+% with Power-Up Punch on Tornadus-Therian), as well as it's coverage boosting to levels as well. Thunder Punch is more welcomed choice over Drain Punch as it helps against bulky Water-types such as Slowbro and Toxapex especially, but Drain Punch can increase longevity. The beauty of this set is unlike the Mach Punch set, it isn't completely walled by Tsareena or Bruxish which can catch them by surprise with it's sheer power.
Salamence @ Return
Ability: Intimidate/Moxie
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Dragon Dance
- Dragon Claw/Fire Fang/Roost
- Aerial Ace
- Earthquake
Return essentially turns Salamence in lite Mega Salamence, I'm sure you could pull some sort of bulky set with this but for now it's just straight investment into sheer power. Aerial Ace becomes an amazing 102 Flying STAB for Salamence, whilst Dragon Claw although not as powerful as Outrage, doesn't lock you in. Dragon Claw can also be interchangeable for Roost as recovery or Fire Fang to hit Pokemon such as Celesteela, Ferrothorn or Skarmory whilst Earthquake is generally a better choice for it's last move to hit Heatran, Magearna and Toxapex the hardest.
Ambipom @ Return
Ability: Technician
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Double Hit
- U-turn
- Fire Punch/Knock Off
- Power-Up Punch
This one is more so of a fun one but I find Ambipom can hit things pretty dang hard, especially with Double Hit. Double Hit becomes a 2-Hit 102 Base power STAB option, doing huge damage to Pokemon who do not resist or are immune. 102 Base power U-turn is great on a Pokemon with base 115 speed, whilst Power-Up Punch gives an option against Steel/Rock-types whilst boosting Ambipom's attack. Fire Punch allows you to hit Celesteela, Magearna and Skarmory super effectively whilst Knock Off despite not being too useful in this metagame, gives Ambipom a 102 Dark-Type move for Ghost-types such as Gengar or Blacephalon, especially the latter. Knock Off is used over Shadow Claw due to some Pokemon still preferring to use items in this metagame, such as Toxapex with Black Sludge.