Hiya! I'm peering in and leaving my mark with a nice set I've been testing over Shoddy. It's been causing havoc among the battles I've played, and the screams of frustration make me weep happy tears of joy.
Hopefully you'll all like it as much as I do. :3
Status: Proofreading needed! ^^
Jirachi Analysis
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[SET]
name: Cosmic Power
move 1: Cosmic Power
move 2: Wish / Substitute
move 3: Fire Punch
move 4: Toxic
Item: Leftovers
Nature: Careful
EVs: 252 HP / 176 Def / 80 SpD
[SET COMMENTS]
<p>Jirachi has a reputation for being the most annoying Pokémon ever created, and this set supports this claim. The goal is to accumulate as many Cosmic Power boosts as possible before wearing anything down by using Toxic. Because of Jirachi's amazing 100/100/100 defenses, Wish, and brilliant typing; it normally has no problem setting up more than one Cosmic Power.</p>
<p>This Jirachi is easy to use, but it can't be put into a team that won't make the best use out of it. This Jirachi works best on stall teams, preferably teams with Sandstorm.</p>
[ADDITIONAL COMMENTS]
<p>An EV spread of 252 HP / 176 Def / 80 SpD allows Jirachi to survive a +2 Close Combat from Infernape. Three Cosmic Powers can turn an Adamant Choice Band Tyranitar's Earthquake into a 3HKO. This Jirachi can be a reliable counter to powerful sweepers once it has accumulated a few boosts, and proceed to wear them down via Fire Punch or Toxic.</p>
<p>Toxic and Wish form the crux of this set, as with Cosmic Power, it allows Jirachi to avoid being KO'd by most of its common counters. Substitute can be used if you really want to avoid status or just want a buffer against some attacks to allow Jirachi to score some more boosts. Fire Punch is the main attack as it allows Jirachi to hit any Steel-type that is immune to Toxic. However, you must be wary of Heatran who completely walls this set and can take Fire Punch for a free boost. No Speed EVs are necessary on this set, although if you care more about outspeeding certain threats and setting up, feel free to rearrange the EVs as you see fit. </p>
<p>Even though this Jirachi is very difficult to take down, some notable counters do exist. Sleep Talk + Roar Suicune provides a lot of problems, taking negligible damage from all your moves bar Toxic (which it removes using Rest), and can also Roar away your stat boosts. Skarmory does a similar job, abusing your turns of set up by Spiking the field and then Whirlwinding you away. It can also Roost off any damage you inflict with Fire Punch. Heatran is easily the most threatening Pokemon to this set, who is immune to both Jirachi's attacking moves and can hit back with a powerful Earth Power or STAB Fire-type move. Tentacruel also causes problems, being immune to Toxic, resisting Fire Punch and setting up Toxic Spikes in your face.
Most of these counters and similar ones like it can be taken down by a Choice Scarf Magnezone. Beware that both Jirachi and Magnezone share Ground- and Fire-type weaknesses, so pairing these two with a Bulky Water like Swampert or a Flying-type, such as Salamence or Gyarados, is a good idea. Heatran can be dealt with by a bulky Tyranitar, who has the added bonus of setting up Sandstorm.</p>
<p>Jirachi also fears Pokémon who set-up, even though most of them fear Toxic. Swords Dance Scizor is the most notable threat, being immune to Toxic and taking Jirachi down with Superpower, but it must be wary of being OHKOd by Fire Punch. Dragon Dance Tyranitar can switch in on Fire Punch and set up, hitting back hard with Earthquake, although Toxic will eventually take its toll.</p>
Hopefully you'll all like it as much as I do. :3
Status: Proofreading needed! ^^

Jirachi Analysis
---
[SET]
name: Cosmic Power
move 1: Cosmic Power
move 2: Wish / Substitute
move 3: Fire Punch
move 4: Toxic
Item: Leftovers
Nature: Careful
EVs: 252 HP / 176 Def / 80 SpD
[SET COMMENTS]
<p>Jirachi has a reputation for being the most annoying Pokémon ever created, and this set supports this claim. The goal is to accumulate as many Cosmic Power boosts as possible before wearing anything down by using Toxic. Because of Jirachi's amazing 100/100/100 defenses, Wish, and brilliant typing; it normally has no problem setting up more than one Cosmic Power.</p>
<p>This Jirachi is easy to use, but it can't be put into a team that won't make the best use out of it. This Jirachi works best on stall teams, preferably teams with Sandstorm.</p>
[ADDITIONAL COMMENTS]
<p>An EV spread of 252 HP / 176 Def / 80 SpD allows Jirachi to survive a +2 Close Combat from Infernape. Three Cosmic Powers can turn an Adamant Choice Band Tyranitar's Earthquake into a 3HKO. This Jirachi can be a reliable counter to powerful sweepers once it has accumulated a few boosts, and proceed to wear them down via Fire Punch or Toxic.</p>
<p>Toxic and Wish form the crux of this set, as with Cosmic Power, it allows Jirachi to avoid being KO'd by most of its common counters. Substitute can be used if you really want to avoid status or just want a buffer against some attacks to allow Jirachi to score some more boosts. Fire Punch is the main attack as it allows Jirachi to hit any Steel-type that is immune to Toxic. However, you must be wary of Heatran who completely walls this set and can take Fire Punch for a free boost. No Speed EVs are necessary on this set, although if you care more about outspeeding certain threats and setting up, feel free to rearrange the EVs as you see fit. </p>
<p>Even though this Jirachi is very difficult to take down, some notable counters do exist. Sleep Talk + Roar Suicune provides a lot of problems, taking negligible damage from all your moves bar Toxic (which it removes using Rest), and can also Roar away your stat boosts. Skarmory does a similar job, abusing your turns of set up by Spiking the field and then Whirlwinding you away. It can also Roost off any damage you inflict with Fire Punch. Heatran is easily the most threatening Pokemon to this set, who is immune to both Jirachi's attacking moves and can hit back with a powerful Earth Power or STAB Fire-type move. Tentacruel also causes problems, being immune to Toxic, resisting Fire Punch and setting up Toxic Spikes in your face.
Most of these counters and similar ones like it can be taken down by a Choice Scarf Magnezone. Beware that both Jirachi and Magnezone share Ground- and Fire-type weaknesses, so pairing these two with a Bulky Water like Swampert or a Flying-type, such as Salamence or Gyarados, is a good idea. Heatran can be dealt with by a bulky Tyranitar, who has the added bonus of setting up Sandstorm.</p>
<p>Jirachi also fears Pokémon who set-up, even though most of them fear Toxic. Swords Dance Scizor is the most notable threat, being immune to Toxic and taking Jirachi down with Superpower, but it must be wary of being OHKOd by Fire Punch. Dragon Dance Tyranitar can switch in on Fire Punch and set up, hitting back hard with Earthquake, although Toxic will eventually take its toll.</p>