Most people have seen teams with one pokemon on it that have this. I have two with it but then the other four are pretty much just to cover their weaknesses so they are pretty much covered.
First Team Dedicated Entirely To Serene Grace that i know of
At a glance:




In Depth:

Excadrill
Ability:Sandthrow
Nature:Adamant
Item:Life Orb
E.V.s:20hp, 252 att, 232 spe
MOVESET:
Earthquake
Brick Break
Rock Slide
X-Scissor
I ran brick break over swords dance because he is my lead and he needs to have more coverage. Other then that he usually just switches in on electric type attacks that are going towards Togekiss.

Togekiss
Ability:Serene Grace
Item:Leftovers
Nature:Bold
E.V.s:252 hp, 188 def, 64 sdef, 4 spe
MOVESET:
Air slash
Aura Sphere
Roost
Thunderwave
Classic Thunderwave Air slash Togekiss. This guy can be a beast. I have literally taken out all six of my opponents team with this guy. (my opponent didnt have a ground type so i thunderwaved all of them and thanks to roost they were not doing much damage either).

Jirachi
Ability:Serene Grace
Item:Leftovers
Nature:Jolly
E.Vs: 252 att, 252 spe, 4 hp
MOVESET:
Thunderwave
Thunderpunch
Ice Punch
Iron Head
I know what you must be thinking. A PHYSICAL SWEEPING JIRACHI??? but actually he is really well. With this set he has 299 att and 328 spe. Combine that with thunderwave and the STAB iron head then you are dealing a lot of damage to your opponent. Not to mention the 85 percent chance that your opponent can not do anything either from the 60 percent chance of flinching or the 25 percent chance of paralysis. He and Togekiss are the two stars in the team.

Verizion
Ability:Justice Heart
Item:Life Orb
Nature:Adamant
E.V.s: 252 att, 252 spe, 4 hp
MOVESET:
Holy sword
Leaf Blade
X-scissor
Swords dance
Classic Swords dance set. Leaf blade is for the ground types for jirachi and those pesky water types that have ice type moves for togekiss. He usually can outspeed most things with this set up he has 306 spe so it is good and covers weaknesses

Cresselia
Ability:Levitate
Nature:Calm
Item:Leftovers
E.V.s:252 hp, 108 def, 148 sdef
MOVESET:
Ice beam
Reflect
Thunderwave
Moonlight
Classic wall with thunderwave to help togekiss and jirachi out. I usually switch to this guy if i am in trouble and unless it is a fire type i can usually take them out with this guy due to having reflect out and moonlight and thunderwave. he is the guy i switch in on ground types first unless he is in trouble then i switch in verizion.
Keldeo
Ability:Justice Heart
Nature:Timid
Item:Life Orb
E.V.s: 252 spa, 252 spe, 4 hp
MOVESET:
Boil Over
Hydro Pump
Mystery Sword
Hidden Power (electric)
this guy switches in on other water types usually but can switch in on ground types as well. he is a good all around special sweeper and covers the last thing superefffective against jirachi: fire types.
This is a dream world team just stating that.
First Team Dedicated Entirely To Serene Grace that i know of
At a glance:






In Depth:

Excadrill
Ability:Sandthrow
Nature:Adamant
Item:Life Orb
E.V.s:20hp, 252 att, 232 spe
MOVESET:
Earthquake
Brick Break
Rock Slide
X-Scissor
I ran brick break over swords dance because he is my lead and he needs to have more coverage. Other then that he usually just switches in on electric type attacks that are going towards Togekiss.

Togekiss
Ability:Serene Grace
Item:Leftovers
Nature:Bold
E.V.s:252 hp, 188 def, 64 sdef, 4 spe
MOVESET:
Air slash
Aura Sphere
Roost
Thunderwave
Classic Thunderwave Air slash Togekiss. This guy can be a beast. I have literally taken out all six of my opponents team with this guy. (my opponent didnt have a ground type so i thunderwaved all of them and thanks to roost they were not doing much damage either).

Jirachi
Ability:Serene Grace
Item:Leftovers
Nature:Jolly
E.Vs: 252 att, 252 spe, 4 hp
MOVESET:
Thunderwave
Thunderpunch
Ice Punch
Iron Head
I know what you must be thinking. A PHYSICAL SWEEPING JIRACHI??? but actually he is really well. With this set he has 299 att and 328 spe. Combine that with thunderwave and the STAB iron head then you are dealing a lot of damage to your opponent. Not to mention the 85 percent chance that your opponent can not do anything either from the 60 percent chance of flinching or the 25 percent chance of paralysis. He and Togekiss are the two stars in the team.

Verizion
Ability:Justice Heart
Item:Life Orb
Nature:Adamant
E.V.s: 252 att, 252 spe, 4 hp
MOVESET:
Holy sword
Leaf Blade
X-scissor
Swords dance
Classic Swords dance set. Leaf blade is for the ground types for jirachi and those pesky water types that have ice type moves for togekiss. He usually can outspeed most things with this set up he has 306 spe so it is good and covers weaknesses

Cresselia
Ability:Levitate
Nature:Calm
Item:Leftovers
E.V.s:252 hp, 108 def, 148 sdef
MOVESET:
Ice beam
Reflect
Thunderwave
Moonlight
Classic wall with thunderwave to help togekiss and jirachi out. I usually switch to this guy if i am in trouble and unless it is a fire type i can usually take them out with this guy due to having reflect out and moonlight and thunderwave. he is the guy i switch in on ground types first unless he is in trouble then i switch in verizion.

Keldeo
Ability:Justice Heart
Nature:Timid
Item:Life Orb
E.V.s: 252 spa, 252 spe, 4 hp
MOVESET:
Boil Over
Hydro Pump
Mystery Sword
Hidden Power (electric)
this guy switches in on other water types usually but can switch in on ground types as well. he is a good all around special sweeper and covers the last thing superefffective against jirachi: fire types.
This is a dream world team just stating that.