Don't Bother Rating - I overlooked a key aspect in the Pokedex. Jirachi doesn't learn Rock Slide - If a mod could lock this, that would be great.
This is a conceptual doubles team that I have based around one pokemon - Jirachi. My idea is to create a team of:
2 Support Flinchers
2 Physical Sweepers (That can setup)
2 Special Sweepers (That can setup)
I would use this for PBR and choose 4 out of the 6 pokemon. The following are in no particular order - I don't send them out in the order that I display on this thread.
THE SERENE SETUP
Jirachi@Wide Lens/Leftovers
Bold - Serene Grace
EV: 252 HP/76 Def/86 Sp Def/96 Speed
-Icy Wind
-Rock Slide
-Wish
-Protect/Helping Hand
I simply love this pokemon because of one thing: Serene Grace. This Jirachi EV spread is not designed for attacking, even though it has two offensive moves. Icy Wind lowers both of the opponents speed stats one level. Jirachi has enough EVs in speed to outspeed every pokemon up to base 130 after 1 Icy Wind. From here on, use Rock Slide for a 60% flinch rate on BOTH pokemon! This provides excellent annoyance support while its partner sets up for a sweep. Wish is to heal (primarily) my other support pokemon and Wide Lens ensures Icy Wind and Rock Slide will always hit (It is a bummer if it misses). Now who would work well as a back up flincher for Jirachi? Hmmmm...I remember seeing an interesting thread about this duo recently. :)
Togekiss@Leftovers
Calm - Serene Grace
EV: 252 HP/6 Def/252 Sp Def
-Thunder Wave
-Air Slash
-Wish
-Encore/Safeguard
As explained in Eersnot's thread, this duo can be very annoying and effective. Keep in mind, I don't send them out at the same time because that takes away the purpose of this team. Togekiss and Jirachi can Wish pass to each other and provide flinch/paralysis support for their partner. Encore is useful, but Safeguard would prevent the party from status afflictions.
PHYSICAL SWEEPERS
Gyarados@Wacan Berry
Adamant - Intimidate
EV: 216 HP/16 Atk/176 Def/100 Speed
-Dragon Dance
-Waterfall
-Return
-Stone Edge/Taunt
Gyara is an excellent starter pokemon to pair with Jirachi/Togekiss. It can take a few hits and provides Intimidate for party durability. Basically, DD up until you see fit, then destroy everything with Waterfall and Return (save Empoleon and Shedinja). Stone Edge provides coverage, but Taunt is too much fun to pass up.
Lucario@Expert Belt
Adamant - Inner Focus
EV: 6 HP/252 Atk/252 Speed
-Swords Dance
-Extremespeed
-Close Combat
-Crunch
Honestly, I have never used a Luke before. I'm excited to see how well this will clean up the loose ends after a SD. Lucario is a great starting poke if I suspect a Fake Out (a lot of people forget about its ability for some reason :). I prefer to keep this guy on hold until most of the opponent's team is hurting.
SPECIAL SWEEPERS
Raikou@Leftovers
Timid - Pressure
EV: 64 HP/96 Def/96 Sp Att/252 Speed
-Calm Mind
-Thunderbolt
-HP Ice
-Protect
Yes, I am using CM Raikou! I simply love this thing. I have given it enough defensive EVs to survive selected EQs and Protect is always useful in doubles. Tbolt/HP Ice for coverage. Substitute is a possibility, but I'm not a huge fan of it in doubles.
Porygon-Z@Wise Glasses
Modest - Adaptability
EV: 6 HP/252 Sp Att/252 Speed
-Nasty Plot
-Tri Attack
-Dark Pulse
-HP Ground
Finally, without speed being a major issue (thanks to Icy Wind), Porygon-Z can feel free to set up a Nasty Plot and sweep away! HP ground is there because I have no EQ users on my team and it hurts Heatran badly.
So there is my strategy...Flinch while setting up, then sweep away! I know that scarf-users are more of a threat here, but Icy Wind can wear them down. Give me some feedback - this is, after all, conceptual. :)
*Credit to arkeis.com for artwork
This is a conceptual doubles team that I have based around one pokemon - Jirachi. My idea is to create a team of:
2 Support Flinchers
2 Physical Sweepers (That can setup)
2 Special Sweepers (That can setup)
I would use this for PBR and choose 4 out of the 6 pokemon. The following are in no particular order - I don't send them out in the order that I display on this thread.
THE SERENE SETUP

Jirachi@Wide Lens/Leftovers
Bold - Serene Grace
EV: 252 HP/76 Def/86 Sp Def/96 Speed
-Icy Wind
-Rock Slide
-Wish
-Protect/Helping Hand
I simply love this pokemon because of one thing: Serene Grace. This Jirachi EV spread is not designed for attacking, even though it has two offensive moves. Icy Wind lowers both of the opponents speed stats one level. Jirachi has enough EVs in speed to outspeed every pokemon up to base 130 after 1 Icy Wind. From here on, use Rock Slide for a 60% flinch rate on BOTH pokemon! This provides excellent annoyance support while its partner sets up for a sweep. Wish is to heal (primarily) my other support pokemon and Wide Lens ensures Icy Wind and Rock Slide will always hit (It is a bummer if it misses). Now who would work well as a back up flincher for Jirachi? Hmmmm...I remember seeing an interesting thread about this duo recently. :)

Togekiss@Leftovers
Calm - Serene Grace
EV: 252 HP/6 Def/252 Sp Def
-Thunder Wave
-Air Slash
-Wish
-Encore/Safeguard
As explained in Eersnot's thread, this duo can be very annoying and effective. Keep in mind, I don't send them out at the same time because that takes away the purpose of this team. Togekiss and Jirachi can Wish pass to each other and provide flinch/paralysis support for their partner. Encore is useful, but Safeguard would prevent the party from status afflictions.
PHYSICAL SWEEPERS

Gyarados@Wacan Berry
Adamant - Intimidate
EV: 216 HP/16 Atk/176 Def/100 Speed
-Dragon Dance
-Waterfall
-Return
-Stone Edge/Taunt
Gyara is an excellent starter pokemon to pair with Jirachi/Togekiss. It can take a few hits and provides Intimidate for party durability. Basically, DD up until you see fit, then destroy everything with Waterfall and Return (save Empoleon and Shedinja). Stone Edge provides coverage, but Taunt is too much fun to pass up.

Lucario@Expert Belt
Adamant - Inner Focus
EV: 6 HP/252 Atk/252 Speed
-Swords Dance
-Extremespeed
-Close Combat
-Crunch
Honestly, I have never used a Luke before. I'm excited to see how well this will clean up the loose ends after a SD. Lucario is a great starting poke if I suspect a Fake Out (a lot of people forget about its ability for some reason :). I prefer to keep this guy on hold until most of the opponent's team is hurting.
SPECIAL SWEEPERS

Raikou@Leftovers
Timid - Pressure
EV: 64 HP/96 Def/96 Sp Att/252 Speed
-Calm Mind
-Thunderbolt
-HP Ice
-Protect
Yes, I am using CM Raikou! I simply love this thing. I have given it enough defensive EVs to survive selected EQs and Protect is always useful in doubles. Tbolt/HP Ice for coverage. Substitute is a possibility, but I'm not a huge fan of it in doubles.

Porygon-Z@Wise Glasses
Modest - Adaptability
EV: 6 HP/252 Sp Att/252 Speed
-Nasty Plot
-Tri Attack
-Dark Pulse
-HP Ground
Finally, without speed being a major issue (thanks to Icy Wind), Porygon-Z can feel free to set up a Nasty Plot and sweep away! HP ground is there because I have no EQ users on my team and it hurts Heatran badly.
So there is my strategy...Flinch while setting up, then sweep away! I know that scarf-users are more of a threat here, but Icy Wind can wear them down. Give me some feedback - this is, after all, conceptual. :)
*Credit to arkeis.com for artwork