I've posted a bunch of dumb sets on here before to my miserable failure every time. I hope this one is different. It sure plays better than any Emp I use.
The main problem I encounter with an Emp wall is that everyone switches to a physical Pokémon and you get nothing done except force a switch, which is good for Spikes teams but not for those who are... not... Spikers. Since I don't like the tediousness of setting Spikes up, I needed a better solution. I believe I have found one.
Walling/Defensive Empoleon
Empoleon @ Leftovers / Wide Lens
EVs: 252 hp/100 sp atk/156 sp def
Modest Nature (+SAtk)
Substitute
Hydro Pump / Hydro Cannon
Ice Beam / Grass Knot
Hydro Cannon / Aqua Ring / Roar
Substitute does 3 key things for Empoleon. The first is to guard against the counters. All the Garchomps, Electivires (more on him in a minute), and such obviously can't OHKO if a Sub is up. Secondly, it's a good status blocker and helps Empoleon wall better.
Third is Empoleon's Trait. I once thought it was useless, but it can be abused better than Adaptabiliy on Z even (well it can't kill Bliss but you'll see). The idea here is that unless you are lucky enough to get a Garchomp, you can't always OHKO a counter. So you Sub 2 times more. With 1.5 * 1.5 (sometimes *2 to that) and the given EVs you:
Other moves are "usable filler". Ice Beam is for Dragons or for Grass types, Grass Knot covers Bulky Waters that are more than 2x weak, Roar is Roar, and Aqua Ring helps it wall when people realize what's going on and switch to a tank.
If you run Hydro Cannon, you get a good chance at OHKOing 252 Metagrosses as well as 99 Accuracy with Wide Lens but then the charge turn results in the team's 2nd physical sweeper killing you if you don't get those out.
Foresty's Petaya Offensive Set
Empoleon @ Petaya Berry
252 Sp. Atk, 184 Spd, 60 Sp. Def, 12 HP
(30 HP IV run 72 Sp. Def)
Modest Nature
-Agility
-Substitute
-Hydro Pump / Hydro Cannon
-Grass Knot / Flash Cannon
Sorry for being a douche Foresty, this is a better set.
For the people who want a kamikaze penguin, this is your best bet. Not as useful as the Defensive wall, but still fun and good for the late game. Agility on the switch (with a little Sp. Def you can survive if they don't... sometimes), then you outspeed Scarfcross (thank you, convenient gold standard Speed). Your Subs can't be outpredicted by other Subs now, and you can activate Petaya and Torrent and start murdering people. Hydro Pump with Petaya is now enough to kill Magnezones and Metagrosses and the like, so running Hydro Cannon is only good for having a chance at OHKOing Cresselia with full Sp. Def and HP or finishing Blisseys.
Grass Knot is the better filler since PetayaTorrentPump does top Garchomp, Sceptile, and other things you want to Ice Beam. Flash Cannon is actually a possible filler to break apart the occasional Cradily and to work as STAB if you run Hydro Cannon.
Opinion
The defensive set is the one I've tested most, and it is very good at what it does. Offensive was pretty mediocre, but with an Agility and Petaya it works in the late game well, pretty much killing all the Electric-Fighting-Ground threats one will face. Both sets are walled by Blissey, but so is most anything Special not named Really Lucky Alakazam or Porygon-Z or Jirachi or Celebi.
The main problem I encounter with an Emp wall is that everyone switches to a physical Pokémon and you get nothing done except force a switch, which is good for Spikes teams but not for those who are... not... Spikers. Since I don't like the tediousness of setting Spikes up, I needed a better solution. I believe I have found one.
Walling/Defensive Empoleon

Empoleon @ Leftovers / Wide Lens
EVs: 252 hp/100 sp atk/156 sp def
Modest Nature (+SAtk)
Substitute
Hydro Pump / Hydro Cannon
Ice Beam / Grass Knot
Hydro Cannon / Aqua Ring / Roar
Substitute does 3 key things for Empoleon. The first is to guard against the counters. All the Garchomps, Electivires (more on him in a minute), and such obviously can't OHKO if a Sub is up. Secondly, it's a good status blocker and helps Empoleon wall better.
Third is Empoleon's Trait. I once thought it was useless, but it can be abused better than Adaptabiliy on Z even (well it can't kill Bliss but you'll see). The idea here is that unless you are lucky enough to get a Garchomp, you can't always OHKO a counter. So you Sub 2 times more. With 1.5 * 1.5 (sometimes *2 to that) and the given EVs you:
- OHKO Electivire (guaranteed)
- OHKO Metagross with Hydro Cannon
- OHKO Magnezone with Hydro Cannon (guaranteed)
- OHKO Frail stuff
- OHKO Skarmory (like he's a counter)
Other moves are "usable filler". Ice Beam is for Dragons or for Grass types, Grass Knot covers Bulky Waters that are more than 2x weak, Roar is Roar, and Aqua Ring helps it wall when people realize what's going on and switch to a tank.
If you run Hydro Cannon, you get a good chance at OHKOing 252 Metagrosses as well as 99 Accuracy with Wide Lens but then the charge turn results in the team's 2nd physical sweeper killing you if you don't get those out.
Foresty's Petaya Offensive Set
Empoleon @ Petaya Berry
252 Sp. Atk, 184 Spd, 60 Sp. Def, 12 HP
(30 HP IV run 72 Sp. Def)
Modest Nature
-Agility
-Substitute
-Hydro Pump / Hydro Cannon
-Grass Knot / Flash Cannon
Sorry for being a douche Foresty, this is a better set.
For the people who want a kamikaze penguin, this is your best bet. Not as useful as the Defensive wall, but still fun and good for the late game. Agility on the switch (with a little Sp. Def you can survive if they don't... sometimes), then you outspeed Scarfcross (thank you, convenient gold standard Speed). Your Subs can't be outpredicted by other Subs now, and you can activate Petaya and Torrent and start murdering people. Hydro Pump with Petaya is now enough to kill Magnezones and Metagrosses and the like, so running Hydro Cannon is only good for having a chance at OHKOing Cresselia with full Sp. Def and HP or finishing Blisseys.
Grass Knot is the better filler since PetayaTorrentPump does top Garchomp, Sceptile, and other things you want to Ice Beam. Flash Cannon is actually a possible filler to break apart the occasional Cradily and to work as STAB if you run Hydro Cannon.
Opinion
The defensive set is the one I've tested most, and it is very good at what it does. Offensive was pretty mediocre, but with an Agility and Petaya it works in the late game well, pretty much killing all the Electric-Fighting-Ground threats one will face. Both sets are walled by Blissey, but so is most anything Special not named Really Lucky Alakazam or Porygon-Z or Jirachi or Celebi.