After looking in the analysis, I was surprised not to see this listed among the sets. I made this set and it was used by myself to get to the 4th round of Smogon Tour UU, and also by Mystica who ended up winning the UU Tour. It's been playtested countless times, so I know its viability.
Current analysis: http://www.smogon.com/dp/pokemon/rotom
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[SET]
name: Restalk
move 1: Rest
move 2: Sleep Talk
move 3: Thunderbolt
move 4: Will-O-Wisp
item: Leftovers
ability: Levitate
nature: Bold
evs: 252 HP / 252 Def / 4 SpA
[SET COMMENTS]
<p>Rotom is generally not used as a defensive Pokemon, mainly due to its 50/77/77 defenses. However, handy immunities to Ground, Normal, Fighting, as well as resists to Bug and Flying allow Rotom to comfortably counter quite a few of the UU metagame's biggest threats, notably the Fighters, Swellow, and Scyther.</p>
<p>With maxed HP and Defense, Hitmonlee, Hitmonchan, and Hitmontop all fail to 2HKO with Stone Edge, with the only exception being the occasional Adamant Choice Band Hitmonlee who can 2HKO 17% of the time. You can then begin to Will-O-Wisp to cripple them, or you can fire off STAB Thunderbolts that will 2HKO Life Orb Hitmonlee and 3HKO Hitmonchan and Hitmontop. Swellow fails to even 3HKO on average with Brave Bird and falls prey to Thunderbolt in just a single hit. Scyther fares even worse, failing to 3HKO with Aerial Ace unless it has a Life Orb and a Swords Dance under its belt. </p>
<p>This set also deals with any Dark types thinking they will catch Rotom off guard by switching in and Pursuiting on the switch for the OHKO. At worst, Absol's Choice Band Pursuit does 61% if you stay in. This is only a 2HKO while you burn and cripple it for the rest of the battle. This luxury is not afforded by the other Rotom sets that are OHKO'd by Pursuit whether you switch or not.</p>
<p>When Rotom has taken a few hits, just Rest off the damage and it will be good as new. Sleep Talk is there in order to prevent Pokemon from setting up on you during your sleep.</p>
<p> Thunder or Charge Beam could be used in place of Thunderbolt. Thunder gives added power which could mean the difference in OHKO'ing or not on some threats, such as Scyther and Poliwrath. Charge Beam can turn this into a tanking sweeper of sorts; however, its Special Defense really lets it down when attempting this. In the long run these two can be effective, but Thunderbolt is still the most consistent.</p>
Current analysis: http://www.smogon.com/dp/pokemon/rotom
----
[SET]
name: Restalk
move 1: Rest
move 2: Sleep Talk
move 3: Thunderbolt
move 4: Will-O-Wisp
item: Leftovers
ability: Levitate
nature: Bold
evs: 252 HP / 252 Def / 4 SpA
[SET COMMENTS]
<p>Rotom is generally not used as a defensive Pokemon, mainly due to its 50/77/77 defenses. However, handy immunities to Ground, Normal, Fighting, as well as resists to Bug and Flying allow Rotom to comfortably counter quite a few of the UU metagame's biggest threats, notably the Fighters, Swellow, and Scyther.</p>
<p>With maxed HP and Defense, Hitmonlee, Hitmonchan, and Hitmontop all fail to 2HKO with Stone Edge, with the only exception being the occasional Adamant Choice Band Hitmonlee who can 2HKO 17% of the time. You can then begin to Will-O-Wisp to cripple them, or you can fire off STAB Thunderbolts that will 2HKO Life Orb Hitmonlee and 3HKO Hitmonchan and Hitmontop. Swellow fails to even 3HKO on average with Brave Bird and falls prey to Thunderbolt in just a single hit. Scyther fares even worse, failing to 3HKO with Aerial Ace unless it has a Life Orb and a Swords Dance under its belt. </p>
<p>This set also deals with any Dark types thinking they will catch Rotom off guard by switching in and Pursuiting on the switch for the OHKO. At worst, Absol's Choice Band Pursuit does 61% if you stay in. This is only a 2HKO while you burn and cripple it for the rest of the battle. This luxury is not afforded by the other Rotom sets that are OHKO'd by Pursuit whether you switch or not.</p>
<p>When Rotom has taken a few hits, just Rest off the damage and it will be good as new. Sleep Talk is there in order to prevent Pokemon from setting up on you during your sleep.</p>
<p> Thunder or Charge Beam could be used in place of Thunderbolt. Thunder gives added power which could mean the difference in OHKO'ing or not on some threats, such as Scyther and Poliwrath. Charge Beam can turn this into a tanking sweeper of sorts; however, its Special Defense really lets it down when attempting this. In the long run these two can be effective, but Thunderbolt is still the most consistent.</p>












