This team is based around Jirachi being the late game cleaner. Its done pretty good for me on Shoddy but their are a few weakness that need to be dealt with. So heres the team:
@Leftovers
Impish nature
Stealth Rock
Slack Off
Earthquake
Ice Fang
EVs: 252HP / 192 Def / 24 Atk / 40 Sp def
I actually nicked these EVs off Obi's stall team. They work rather well.
First priority is to set up stealth rock. Although thats not the reason I chose him for my lead. I chose him because he starts a sandstorm which hurts my opponent alot if their not prepared.
@Leftovers
Relaxed/Sassy nature
Surf
Ice Beam
Earthquake
Hidden Power [Electric]
EVs: 240 HP / 192 Def / 52 SpA / 24 Atk
Swampert counters alot of Jirachi's counters. A mixed set provides alot of coverage as well. Now you may be wondering, Why Hidden Power [Ghost]? Well the answer is that it help me to hit Gengar, Uxie, Cresselia, Celebi and a number of other pokemon that usually switch in on him without any worry.
@Choice Scarf
Adamant nature
Outrage
Fire Blast
Earthquake
Stone Edge
EVs: 252Atk / 252 Spd / 6HP
Garchomp is my mid-game sweeper. In the sand he is almost unbeatable. He takes care of alot of things with Outrage although his other moves are wort a mention. FF helps take care of steels, EQ is for STAB and SE takes care of flyers.
@Leftovers
Calm nature
Seismic Toss
Softboiled
Aromatheropy
Flamethrower
EVs: 252 Def / 216 Sp Def / 40 Sp Atk
Blissey is a great Sp Wall. But you already know that. Aromatheropy heals my team from stats problems, Softboiled is for HP recovery, Flamethrower is my attack and Seismic Toss hits whatever Flamethrower can't.
@Life Orb
Mild nature
Thunder Bolt
Hidden Power [Ice]
Explosion
Magnet Rise
EVs: 88HP / 88 Spd / 76 Atk / 252 Sp Atk
Magnezone is a great sweeper and steel killer. HP Ice takes care of Dragons thunder bolt for STAB explosion when I'm at low health and Magnet rise so that I don't get hit by Ground Attacks.
This EV spread allows me to do more damage faster because he ain't gona last long anyway.
@Leftovers
Modest nature
Psychic
Thunder Bolt
Grass Knot
Hidden Power [Ice]
EVs: 252 Sp Atk / 252 Spd / 6HP
Jirachi has an excellent movepool which provides awesome coverage. HP Ice is great for coverage, Psychic is for STAB, Grass Knot is for Swampert and Gastrodon [who I have a problem with. A big one] and T-Bolt takes care of Flyers.
Possible additions to the team:
Well thats the team. Thoughts?

Impish nature
Stealth Rock
Slack Off
Earthquake
Ice Fang
EVs: 252HP / 192 Def / 24 Atk / 40 Sp def
I actually nicked these EVs off Obi's stall team. They work rather well.
First priority is to set up stealth rock. Although thats not the reason I chose him for my lead. I chose him because he starts a sandstorm which hurts my opponent alot if their not prepared.

Relaxed/Sassy nature
Surf
Ice Beam
Earthquake
Hidden Power [Electric]
EVs: 240 HP / 192 Def / 52 SpA / 24 Atk
Swampert counters alot of Jirachi's counters. A mixed set provides alot of coverage as well. Now you may be wondering, Why Hidden Power [Ghost]? Well the answer is that it help me to hit Gengar, Uxie, Cresselia, Celebi and a number of other pokemon that usually switch in on him without any worry.

Adamant nature
Outrage
Fire Blast
Earthquake
Stone Edge
EVs: 252Atk / 252 Spd / 6HP
Garchomp is my mid-game sweeper. In the sand he is almost unbeatable. He takes care of alot of things with Outrage although his other moves are wort a mention. FF helps take care of steels, EQ is for STAB and SE takes care of flyers.

Calm nature
Seismic Toss
Softboiled
Aromatheropy
Flamethrower
EVs: 252 Def / 216 Sp Def / 40 Sp Atk
Blissey is a great Sp Wall. But you already know that. Aromatheropy heals my team from stats problems, Softboiled is for HP recovery, Flamethrower is my attack and Seismic Toss hits whatever Flamethrower can't.

Mild nature
Thunder Bolt
Hidden Power [Ice]
Explosion
Magnet Rise
EVs: 88HP / 88 Spd / 76 Atk / 252 Sp Atk
Magnezone is a great sweeper and steel killer. HP Ice takes care of Dragons thunder bolt for STAB explosion when I'm at low health and Magnet rise so that I don't get hit by Ground Attacks.
This EV spread allows me to do more damage faster because he ain't gona last long anyway.

Modest nature
Psychic
Thunder Bolt
Grass Knot
Hidden Power [Ice]
EVs: 252 Sp Atk / 252 Spd / 6HP
Jirachi has an excellent movepool which provides awesome coverage. HP Ice is great for coverage, Psychic is for STAB, Grass Knot is for Swampert and Gastrodon [who I have a problem with. A big one] and T-Bolt takes care of Flyers.
Possible additions to the team:
Cresselia
Celebi
Dugtrio
Well thats the team. Thoughts?