After speaking with Garganator (the user who first posted this set), I've decided to take this analysis over.
Status: Finished
http://www.smogon.com/dp/pokemon/porygon2
[SET]
name: Offensive Trick Room
move 1: Trick Room
move 2: Ice Beam
move 3: Thunderbolt
move 4: Recover / Tri Attack / Hidden Power Fighting
ability: Download
item: Life Orb
nature: Quiet
evs: 252 HP / 252 SpA / 4 SpD
ivs: 0 Spe
[SET COMMENTS]
<p>While the majority of Porygon2's movesets focus on its defensive capabilities, this set capitalizes on Porygon2's ability to be a self-supporting Trick Room sweeper. After setting up Trick Room, Porygon2 can begin its BoltBeam assault, hitting everything but Lanturn and Shedinja for at least neutral damage. The fourth moveset comes down to how you would like to play Porygon2. Recover is the more defensive option, allowing Porygon2 to attempt multiple sweeps and shrug off any damage it may take upon switching in. Be wary of using Recover in Trick Room, however; Trick Room only lasts for five turns, during which Porygon2 need to do the majority of its sweeping. Speaking of sweeping, Tri Attack is another useful attack Porygon2 has at its disposal, hitting Lanturn for neutral damage and adding a STAB attack to its arsenal. On the other hand, Hidden Power Fighting is a reliable option to hit Steel- and Dark-types harder and for making a larger dent in Chansey as she switches in (Porygon2 can't KO her, however).</p>
[ADDITIONAL COMMENTS]
<p>If you'd like to make Porygon2 a bit bulkier, an alternate spread of 252 HP / 156 SpA / 100 SpD is available. Utilizing this spread makes setting up Trick Room against the likes of special Venusaur and Milotic much easier. However, Porygon will miss out on a 2HKO against specially defensive Clefable with Tri Attack with this investment.</p>
<p>Porygon2's teammates are quite variable and should depend on how you plan to use Trick Room - for Porygon2's benefit alone or for the team as a whole. While Trick Room is in effect, Pokemon with low Speed such as Trapinch, Hariyama, and Slowbro are all decent options, since all three have a much easier time sweeping in Trick Room. Trapinch is typically only seen on Trick Room teams and can act as a potent revenge killer thanks to Arena Trap, a decent base 100 Attack stat, and Quick Attack. Hariyama's ability allows it to absorb status that might hinder other Pokemon. In fact, while under Trick Room, paralysis boosts both Hariyama's Attack and Speed, since it will quarter Hariyama's already low Speed stat and activate Guts at the same time. Slowbro's ability to set up Trick Room and use Slack Off to recover lost HP makes it an excellent supporting tank on Trick Room teams, although its sibling, Slowking, is a better offensive choice since it can boosts its Special Attack quicker via Nasty Plot.</p>
<p>Should you choose to make Porygon2 a standalone Trick Room sweeper, your options for teammates become much more conventional. Absol makes a great switch-in against Ghost-types who expect Tri Attack, as does Skuntank. If your opponent uses Taunt often, Skuntank may be the better of the two, since it's not weak to the Fighting-type attacks that many Ghost-types carry. Blaziken is able to go on the offensive much easier with the absence of Milotic (whom this set KOes with minimal effort) and can handle any Registeel who may try to stall out Trick Room or attempt to wall Porygon2. This set struggles against Hitmontop - especially the TechniTop set - so plan accordingly. Common checks against Hitmontop include Flying-types such as Swellow, Ghost-types like Spiritomb, and Psychic-types such as the aforementioned Slowbro.</p>
Status: Finished

http://www.smogon.com/dp/pokemon/porygon2
[SET]
name: Offensive Trick Room
move 1: Trick Room
move 2: Ice Beam
move 3: Thunderbolt
move 4: Recover / Tri Attack / Hidden Power Fighting
ability: Download
item: Life Orb
nature: Quiet
evs: 252 HP / 252 SpA / 4 SpD
ivs: 0 Spe
[SET COMMENTS]
<p>While the majority of Porygon2's movesets focus on its defensive capabilities, this set capitalizes on Porygon2's ability to be a self-supporting Trick Room sweeper. After setting up Trick Room, Porygon2 can begin its BoltBeam assault, hitting everything but Lanturn and Shedinja for at least neutral damage. The fourth moveset comes down to how you would like to play Porygon2. Recover is the more defensive option, allowing Porygon2 to attempt multiple sweeps and shrug off any damage it may take upon switching in. Be wary of using Recover in Trick Room, however; Trick Room only lasts for five turns, during which Porygon2 need to do the majority of its sweeping. Speaking of sweeping, Tri Attack is another useful attack Porygon2 has at its disposal, hitting Lanturn for neutral damage and adding a STAB attack to its arsenal. On the other hand, Hidden Power Fighting is a reliable option to hit Steel- and Dark-types harder and for making a larger dent in Chansey as she switches in (Porygon2 can't KO her, however).</p>
[ADDITIONAL COMMENTS]
<p>If you'd like to make Porygon2 a bit bulkier, an alternate spread of 252 HP / 156 SpA / 100 SpD is available. Utilizing this spread makes setting up Trick Room against the likes of special Venusaur and Milotic much easier. However, Porygon will miss out on a 2HKO against specially defensive Clefable with Tri Attack with this investment.</p>
<p>Porygon2's teammates are quite variable and should depend on how you plan to use Trick Room - for Porygon2's benefit alone or for the team as a whole. While Trick Room is in effect, Pokemon with low Speed such as Trapinch, Hariyama, and Slowbro are all decent options, since all three have a much easier time sweeping in Trick Room. Trapinch is typically only seen on Trick Room teams and can act as a potent revenge killer thanks to Arena Trap, a decent base 100 Attack stat, and Quick Attack. Hariyama's ability allows it to absorb status that might hinder other Pokemon. In fact, while under Trick Room, paralysis boosts both Hariyama's Attack and Speed, since it will quarter Hariyama's already low Speed stat and activate Guts at the same time. Slowbro's ability to set up Trick Room and use Slack Off to recover lost HP makes it an excellent supporting tank on Trick Room teams, although its sibling, Slowking, is a better offensive choice since it can boosts its Special Attack quicker via Nasty Plot.</p>
<p>Should you choose to make Porygon2 a standalone Trick Room sweeper, your options for teammates become much more conventional. Absol makes a great switch-in against Ghost-types who expect Tri Attack, as does Skuntank. If your opponent uses Taunt often, Skuntank may be the better of the two, since it's not weak to the Fighting-type attacks that many Ghost-types carry. Blaziken is able to go on the offensive much easier with the absence of Milotic (whom this set KOes with minimal effort) and can handle any Registeel who may try to stall out Trick Room or attempt to wall Porygon2. This set struggles against Hitmontop - especially the TechniTop set - so plan accordingly. Common checks against Hitmontop include Flying-types such as Swellow, Ghost-types like Spiritomb, and Psychic-types such as the aforementioned Slowbro.</p>