I'm really interested to see what others think of this theorymon, ie. how it would affect the metagame and such. To me, it seems like a small change that offers a host of new opportunities for what is currently a solid C-Rank Pokemon (in terms of viability,) and while it wouldn't necessarily shake the metagame up and it has counters, it would really pull its weight on a team.
- What kind of role will Empoleon take? Utility check to offensive threats such as Latios, Latias, Manaphy, Starmie, Genesect, and Talonflame, dedicated Defog user, or offensive tank with 3 attacks and Roost?
The immediate thing I think in terms of Empoleon's role is a Defog/hazard support role, very similarly to Skarmory. In fact, the set that Salt the Flesh posted is very,
very similar to what many Skarmory run. The main differences are in typing, bulk (Skarmory's physical bulk is better than Empoleon's special bulk, but Skarmory's weakness to special moves is more prominent than Empoleon's weakness to physical moves,) and the single attacking move (Scald has a clear advantage in being able to spread burns.) However...
- What will Empoleon's most successful set look like, and how many effective sets will it have?
While I think it would excel as a bulky hazard maintenance mon with special bulk and unique typing, it could easily run a bunch of other sets. I see a bunch of people claiming that 4MSS hurts Empoleon too much to be a threat, but I really don't understand how you could look at a bulky mon getting instant recovery and think that isn't helpful. Like Salt the Flesh said, you can really play around with Empoleon's last two moves a lot and get a viable threat no matter what. It can phaze, hit fairly hard with a tank set or even stall with Toxic (while being immune to the status.) It could still go an offensive route as well, as the SubPetaya set from Gen 4 would likely do much better with less predictability and fewer Scarfers (it helps that while Empoleon
is weak to Fighting-type priority, it resists Steel, Normal, Water, Ice and Flying-type priority, letting it get the leg up on some prominent priority users with an Agility in tow.)
While I'm thinking about it...
If the addition of Roost is compatible with Defog and Stealth Rock, it could serve some use as a decent utility. Unfortunately I just feel like Roost isn't going to save Empoleon from obscurity, especially with all of the Lucario, Venusaur, and Earthquake users saturating the XY metagame. Its stats and typing just aren't what they used to be. I'd rather just run Excadrill for hazards, as its offensive pressure is a lot more relevant, and its pretty reliable at getting a Rapid Spin off.
Yeah, Empoleon has weaknesses. Like pretty much every other Pokemon. Fortunately, Empoleon doesn't need to take every attack on its own. A wonderful defensive partner for Empoleon is
Gliscor, who is immune to two of Empoleon's weaknesses while resisting the third. Meanwhile, Empoleon resists both of Gliscor's weaknesses (4x resisting his 4x weakness,) and has the special bulk to take hits aimed at him (and vice versa.) The synergy there seems pretty fantastic, though I'm sure there are plenty of other mons that can cover Empoleon's weaknesses.
- What kind of playstyle will Empoleon's presence benefit and hurt more?
Empoleon likely has the best chances on Bulky Offense and Semi-Stall teams, though really it can benefit any team in need of hazard removal so long as the defensive synergy is there. I don't think that Empoleon would really hurt a playstyle too much; as said earlier, there are definitely answers to him. Stall may have a rough time being able to outdamage his Roosts or Toxic him, though. Despite sharing some type similarities with Politoed, Empoleon may also see more use as a hazard maintenance mon on rain teams, as it makes those Scalds hurt a bit more.
- Which Pokemon would benefit the most from Empleon's newfound viability in OU, and what Pokemon would be hurt the most?
As I mentioned earlier, Gliscor makes a wonderful defensive partner to Empoleon. He also threatens to do major damage with Earthquake (though if Empoleon isn't weakened it will likely survive and OHKO back with Scald,) so it also stands out as a solid answer for slightly weakened Empoleon. As such, Gliscor would likely see more usage. Mega Venusaur and Ferrothorn, both lacking an Ice weakness, also stand as decent answers to hazard-setting Empoleon. A lot of the Pokemon that would rise and fall in usage depend on what sets become most prominent, but I think there exist enough high-ranking Pokemon that answer Empoleon where it would certainly be viable and useful, but not game-shifting.
Edit:
Looks like with a lack of boosting moves (Iron Defense and Swords Dance lol) Utility is going to be its best option.
It gets Agility too. Seriously, the SubPetaya Agility set was Empoleon's signature back in its Gen 4 OU days.