Arifeen told me to post here so...
Linoone @ Brightpowder / Starf Berry / Sitrus Berry
Ability: Gluttony / Pickup
EVs: 248 HP / 4 Atk / 252 SDef / 4 Spe
Careful Nature
-Substitute
-Belly Drum
-Extreme Speed
-Seed Bomb
The beauty of this set is that not only does it completely lure Seismitoed, but it can also immediately win the game for its user. Naturally, no one is going to switch out Seismitoed once a Linoone comes in, because no one wants to let Linoone Belly Drum for free. Seed Bomb also does not OHKO Seismitoed, so there is not a lot of risk for the Seismitoed player. Earth Power does not KO Linoone after a Belly Drum, so the Seismitoed user is guaranteed to use Scald or Toxic. This is where Substitute comes in. Not only does it block Toxic, but it also lets Linoone set up for free on Seismitoed without the risk of a burn due to the given investment.
0 SpA Seismitoad Scald vs. 248 HP / 252+ SpD Linoone: 73-87 (20.3 - 24.2%) -- possible 6HKO after Leftovers recovery
After setting up a Substitute, Linoone can proceed to Belly Drum, at which point both Seismitoed and the opposition's team will be left facing a behemoth. Needless to say, Seed Bomb OHKOs Seismitoed at +6. The Seismitoed user will be forced to stay in, as otherwise, Linoone will be able to get up a Substitute for free. In addition, there is also a chance that Earth Power will not break the Substitute, making this Pokemon even more effective.
0 SpA Seismitoad Earth Power vs. 248 HP / 252+ SpD Linoone: 84-99 (23.3 - 27.5%) -- possible 5HKO after Leftovers recovery
A Sitrus Berry can be used to restore Linoone's HP and potentially let it tank a weak hit after Belly Drumming; Pickup should be used if this item is chosen since Gluttony does not work with the Sitrus Berry. However, a Starf Berry is the preferred item on this set. For those who are unaware, the Starf Berry raises a random stat by two stages when its user is at 25% HP or less. Gluttony, however, makes this berry work at 50% or less, meaning Linoone will be able to reap its potential rewards after Belly Drumming. The main draw of this item is its potential to raise Linoone's evasion. Imagine facing a +6 Attack monster that also has a +2 Evasion boost; the game would end immediately. No other item is really necessary, so because of this, Starf Berry is the preferred option due to its ability to potentially end a game by itself. The chance to raise defenses or Speed might occasionally prove useful as well. So there you have it, a lure that not only eliminates Seismitoed, but can single-handedly win games as well.