Empoleon: Forcing Greninja to run Low Kick is actually a point in Empoleon's favor, since it makes Greninja significantly easier to beat. With that, the standard set pretty much needs Ice Beam/Gunk Shot/Low Kick, which leaves exactly one coverage option. Not sure how hard it gets hit, but Ferrothorn is probably more comfortable switching into Low Kick than HP Fire, while there's still the Dark Pulse/Extrasensory/Grass Knot options. Limiting Greninja to one optional move (Ice Beam is essentially his main STAB, and no Gunk Shot = No Fairy KOs) immediately hinders the versatility that makes him arguably the best Pokemon in the Metagame. And this comes on top of the mentioned benefits like hard-stopping Electric Types and Volt Switchers. Scald burns also hinder the attempts to manually switch, which helps given Empoleon's bulk is mainly Special. On top of that, Empoleon's key resistances w/ Lightningrod let him switch into several threats:
- Non-EQ Zard-X
- Non-Superpower/Focus Blast Thundurus
- Mega Manectric
- Non-Superpower Azumarill (is Superpower standard on it now?)
- Both Latis (unless Latios carries Earthquake)
- Mega Scizor without Superpower (which is slashed at best on anything but the offensive SD set)
- Fire Blast Altaria
- Rotom-W (obvious)
- Magnezone (A Steel that can reliably beat him is a godsend to avoid trapping)
Obviously lack of recovery means he can't check too many of these at once, but consider Empoleon's 2 sets.
If a set doesn't hate Specs Hydro Pump or Ice Beam (Azumarill, Bulky WoW Zard-X (Calc's bulky DD set risks OHKO), Roost Scizor (Offensive is OHKO'd after Rocks, still likely without), Rotom-W), they equally hate prospect of a Scald Burn or Toxic from the Defensive/Defog set crippling their offenses or ruining sweep potential.
LR Empoleon wouldn't necessarily be a game defining sweeper, but the likelihood of seeing Greninja + any of these other mons on an offensive team means Empoleon will almost always put in work somewhere.
- Infernape: I was slightly heartbroken when this didn't win. It's VERY good in our current metagame because stall is pretty good at the moment. Two things stopping it from fulfilling its niche, however, are Slowbro and Sableye--the two best stall megas out there at the moment. Slowbro is a problem even before Mega Evolution because Scald 2HKO's, so you can't Slack Off stall it; Sableye, once it's Mega Evolved, can switch in on Infernape and bounce back everything it can do. Any stall teams lacking these two megas, however, can and will be shut down by this monstah.
While a Stall team without those Megas would be vulnerable to Prankster Infernape, that's like suggesting an early XY team without Aegislash: that condition is virtually non-exsistant because of those mon's importance to the playstyle or Meta game. Sableye in particular is very likely because on top of being a solid Stallmon himself, Prankster and Magic Bounce also mean he can give Stall trouble. Sableye puts in so much work and is so integral to the playstyle right now that being stopped by him alone is a serious point against anything as a Stallbreaker.