To get away from the ban talk (which I mostly agree with, for the record), here's a cool set that I'm enjoying while I can (in the pre-bank meta):
Pheromosa @ Life Orb
Ability: Beast Boost
EVs: 32 Atk / 228 SpA / 248 Spe
(OR 44 Atk / 216 SpA / 248 Spe)
Mild Nature
- U-turn
- High Jump Kick
- Hidden Power [Ground]
(OR [Electric])
- Ice Beam
I've seen people experimenting with similar lure sets, but this is what I've settled on for the moment. Right now Pheromosa is very much feared when it comes to teambuilding, and thus fast Megas like Zam and Scarf users that hit 438 Speed and below aren't used very much because Naive/etc. Pheromosa easily outspeeds, reducing their effectiveness as revenge killers. As such, you can currently get away with a neutral nature, giving you just enough Speed to outpace Ash Greninja, and more relevantly, Tapu Koko. 130-150 is pretty much a dead zone anyway. Mild is my nature of choice because it tanks Scald from Toxapex better. The choice of spread comes down to whether you want SpA boosts or Spe boosts with Beast Boost -- both have their merits. Speed is helpful since you're not running a +Spe nature, but Special Attack can facilitate a sweep much easier.
The moveset utilizes Phero's standard strength through powerful U-turn moment + High Jump Kick, just with a bit less investment. I opted for these moves over a full special set due to their reliability (I will never use Focus Blast unless I have to) and mixed wall-breaking power. The real draw of this set is Hidden Power, which muscles through common checks. The choice between Ground and Electric picks your counters, but Ground seems better in the current Meta, as it handles Aegi + Maro. Electric handles Pelli + Mantine. Both handle Toxapex. Calcs:
228+ SpA Life Orb Pheromosa Hidden Power Ground vs. 248 HP / 8 SpD Toxapex: 143-169 (47.1 - 55.7%) -- guaranteed 2HKO after Stealth Rock and Black Sludge recovery
228+ SpA Life Orb Pheromosa Hidden Power Ground vs. 252 HP / 252+ SpD Marowak-Alola: 161-190 (49.6 - 58.6%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
228+ SpA Life Orb Pheromosa Hidden Power Ground vs. 252 HP / 4 SpD Aegislash-Shield: 135-161 (41.6 - 49.6%) -- 27% chance to 2HKO after Stealth Rock
(requires prior damage/lack of Shadow Sneak)
228+ SpA Life Orb Pheromosa Hidden Power Electric vs. 252 HP / 252+ SpD Mantine: 218-260 (58.2 - 69.5%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
228+ SpA Life Orb Pheromosa Hidden Power Electric vs. 252 HP / 252+ SpD Pelipper: 348-411 (107.4 - 126.8%) -- guaranteed OHKO
(lol)
This set is a little more prediction heavy than the standard set, but it can plow through teams that rely on the above Pokemon to check Pheromosa over simply using revenge killers. Ice/Electric and Ice/Ground are both solid coverage combos, so you can often clean teams without touching your STABs except to U-turn around. Aside from the common checks above, you'll often find this added coverage coming in handy against unexpected foes, like Goliospod. I've been using small tweaks on this set on the Gen 7 OU ladder and am currently 9-0 for this new alt.
Here's my first match on the alt, where I beat Toxapex 1v1 and then wipe through Buzzwole and the rest of the team:
http://replay.pokemonshowdown.com/gen7ou-482628706
Here's another lowish ladder replay that shows the potential of the set (Electric variant). My opponent wasn't the best, but you can see how I can clean with only my special moves, including Goliospod:
http://replay.pokemonshowdown.com/gen7ou-482634504
For reference, in all my other matches, Pheromosa just did what it always does, U-turning around for massive damage and threatening opponents with High Jump Kick and coverage, so the replays aren't worth showing for the purpose of this thread. And that's the point -- you can almost entirely play this set like normal Phero except when your coverage is needed. I encountered Mega Alakazam once, and all I had to do was cover it with another member of my team (in this case, the similarly busted Aegislash). The lack of Poison Jab is definitely noticed when it comes to revenge killing full health Tapus, but again, you just need to cover them in different ways through other team members.
I still think the standard set remains the most consistent and effective, but in the current metagame, where every player is terrified of this thing and throws on Toxapex and Marowak with no second thoughts, this Mild lure set can effectively clean late game by breaking common walls. It can especially be effective if paired with something else that struggles with Pokemon that take on Pheromosa, like Magnezone in the case of Alolan Marowak. Give it a shot!