I've made this team just last night and testing it today it is currently, 4-3, so here it is:
Ambipom@Leftovers
Timid
EVs: 4 SpA/252 Spe/252 HP
~Baton Pass
~Swift
~Taunt
~Nasty Plot
I use this as my lead and so far it's proven in some of the 7 battles I've had so far to be be somewhat useful. It is able to get one Nasty Plot up or if I know the opponent is not going to attack I just use Taunt. I then Baton Pass the NP boost to Dragonite who will then use Draco Meteor where only the NP boost will be nullified managing to net at least one kill for Dragonite. Opponents I've found to be troublesome for Ambipom are Choice Scarf users who hit hard such as Flygon.
Dragonite@Choice Scarf
Naughty
EVs: 74 SpA/184 Spe/252 Atk.
~Draco Meteor
~Outrage
~Earthquake
~Fire Blast
This is my revenge killer for the team, he's the main reason for me having four wins so far. The only problem I've found when using him is that he isn't that bulky, kind of like a glass cannon sort of. Outrage and Draco Meteor are for powerful STAB moves that hurt quite a bit and Earthquake is for more coverage. I was thinking about replacing Fire Blast with something, perhaps Flamethrower as the accuracy that comes with Fire Blast could screw me over at crucial moments.
Gengar@Choice Specs
Timid
EVs: 4 HP/252 SpA/252 Spe
~Focus Blast
~Shadow Ball
~Thunderbolt
~Trick
This is my pure special sweeper and he has proven his usefulness by netting some KOs on the opponents' side of the field. I don't really see the usefulness in Trick so I'm going to try and replace it with something but, I don't know what.
Infernape@Life Orb
Naive
EVs: 24 Atk./232 Spe/252 SpA
~HP Ice
~Close Combat
~Flamethrower
~Grass Knot
MixApe, what he brings to the team is some more coverage but Fighting is covered already with Gengars' Focus Blast but his fighting move is more accurate with the downside of weakened defenses after each use. Fire is also already covered by Dragonites' Fire Blast but, again accuracy issues arise. The other moves are for coverage mainly, he hasn't really netted any KOs, mostly the opponent was the one KO'ing him.
Mamoswine@Choice Band
Adamant
EVs: 64 HP/192 Spe/252 Atk.
~Ice Shard
~Ice Fang
~Earthquake
~Stone Edge
Another physical sweeper for the team, his downside is his speed but he makes up for that with Ice Shard. This move has proven itself in many crucial moments where if I didn't have it I probably would've lost. I don't really see the point in having two ice moves when he only really needs one. Plus the fact that one of the Ice moves(Ice Fang), happens to be inaccurate at the worst times. This usually spells the end for Mamoswine if he's up against an opponent who can KO him but is faster than the opponent, uses Ice Fang, it misses and the opponent KOs you. Stone Edge is also another inaccurate move but the power is needed to net some KOs for Mamoswine, and Earthquake for STAB.
Jirachi@Choice Specs
Timid
EVs: 80 HP/176 Spe/252 SpA
~HP Ground
~Psychic
~Thunderbolt
~U-Turn
The star of the show, this is also another one of the main reasons for me having more wins than losses currently. Brings pain to those that think they can KO it easily. Though it has been KO'ed in one fell swoop from Mamoswines' EQs and Tyranitars' EQs as well.
So that's my team in its' entirety, please rate as best as you guys can thanks for taking the time to read the teams' explanation.

Ambipom@Leftovers
Timid
EVs: 4 SpA/252 Spe/252 HP
~Baton Pass
~Swift
~Taunt
~Nasty Plot
I use this as my lead and so far it's proven in some of the 7 battles I've had so far to be be somewhat useful. It is able to get one Nasty Plot up or if I know the opponent is not going to attack I just use Taunt. I then Baton Pass the NP boost to Dragonite who will then use Draco Meteor where only the NP boost will be nullified managing to net at least one kill for Dragonite. Opponents I've found to be troublesome for Ambipom are Choice Scarf users who hit hard such as Flygon.

Dragonite@Choice Scarf
Naughty
EVs: 74 SpA/184 Spe/252 Atk.
~Draco Meteor
~Outrage
~Earthquake
~Fire Blast
This is my revenge killer for the team, he's the main reason for me having four wins so far. The only problem I've found when using him is that he isn't that bulky, kind of like a glass cannon sort of. Outrage and Draco Meteor are for powerful STAB moves that hurt quite a bit and Earthquake is for more coverage. I was thinking about replacing Fire Blast with something, perhaps Flamethrower as the accuracy that comes with Fire Blast could screw me over at crucial moments.

Gengar@Choice Specs
Timid
EVs: 4 HP/252 SpA/252 Spe
~Focus Blast
~Shadow Ball
~Thunderbolt
~Trick
This is my pure special sweeper and he has proven his usefulness by netting some KOs on the opponents' side of the field. I don't really see the usefulness in Trick so I'm going to try and replace it with something but, I don't know what.

Infernape@Life Orb
Naive
EVs: 24 Atk./232 Spe/252 SpA
~HP Ice
~Close Combat
~Flamethrower
~Grass Knot
MixApe, what he brings to the team is some more coverage but Fighting is covered already with Gengars' Focus Blast but his fighting move is more accurate with the downside of weakened defenses after each use. Fire is also already covered by Dragonites' Fire Blast but, again accuracy issues arise. The other moves are for coverage mainly, he hasn't really netted any KOs, mostly the opponent was the one KO'ing him.

Mamoswine@Choice Band
Adamant
EVs: 64 HP/192 Spe/252 Atk.
~Ice Shard
~Ice Fang
~Earthquake
~Stone Edge
Another physical sweeper for the team, his downside is his speed but he makes up for that with Ice Shard. This move has proven itself in many crucial moments where if I didn't have it I probably would've lost. I don't really see the point in having two ice moves when he only really needs one. Plus the fact that one of the Ice moves(Ice Fang), happens to be inaccurate at the worst times. This usually spells the end for Mamoswine if he's up against an opponent who can KO him but is faster than the opponent, uses Ice Fang, it misses and the opponent KOs you. Stone Edge is also another inaccurate move but the power is needed to net some KOs for Mamoswine, and Earthquake for STAB.

Jirachi@Choice Specs
Timid
EVs: 80 HP/176 Spe/252 SpA
~HP Ground
~Psychic
~Thunderbolt
~U-Turn
The star of the show, this is also another one of the main reasons for me having more wins than losses currently. Brings pain to those that think they can KO it easily. Though it has been KO'ed in one fell swoop from Mamoswines' EQs and Tyranitars' EQs as well.
So that's my team in its' entirety, please rate as best as you guys can thanks for taking the time to read the teams' explanation.