This was a pretty quick team I developed as Im trying to get some themes going. As this was put together relatively quickly, I didnt really look to much to threats and counters to this team, so criticism and advice welcomed. Since this is a BP Chain, SR/Spikes/T Spikes etc hurts. Im going to be combining these two things.

Azelf @ Focus Sash
Levitate
252 Spe / 200 SpA / 56 Att
Naive
- Stealth Rock
- Psychic
- Fire Blast
- Explosion
The point of the Azelf lead is to take out at least one of the enemies pokemon and lay down the rocks. I want to dent my opponents team before I come in with the real stuff. I sacrificed some Sp.Att EVs because its vital that I can KO at least one pokemon with Explosion.

Ninjask @ Liechi Berry
Speed Boost
252 HP / 144 Spe / 52 Def / 56 Sp.Def
Jolly
- Swords Dance
- Protect
- Baton Pass
- Substitute
The idea here is to stall for speed boost and activate the liechi berry. First turn I protect, getting in the first Speed Boost, getting in the occasional SD if the situation permits (ie. a switch which allows the sub). Basically Im going Protect, Sub, Protect, Sub (unless a sub lives, then I sd). The EVs are to allow a semi effective Ninjask sub. The biggest counter to this set is taunt leads and Priority users, like anti-lead vile (with ice shard instead of punch, something Ive always liked and see alot). This is why I am using Azelf as the suicide, to get stuff like that out of the way.

Celebi @ Leftovers
Natural Cure
252 HP / 100 Def / 64 Sp.Def / 24 Spe / 64 Att
------- (Couldnt think of what to go with, sorry)
- Calm Mind
- Seed Bomb
- Baton Pass
- Psychic
This is one who can receive Ninjask Baton Pass. With deadly speed and the boosted attack, this thing will be . Seed Bomb is going to leave a large dent in anything that doesnt resist it. After I get up enough Calm Minds, Ill be ready to pass the ample boosts. Psychic is there to take advantage of CM if Celebi come in at a different point in the game. Again, the EV's are to allow a bulky set capable of taking hits. If Celebi is brought in, I plan on setting up Jolteon with it.
Problems I see with this set are the shared Fire and Ice weaknesses Ninjask and Celebi share, and Celebi can get hit for SE damage right off the bat, which hurts. I dont have to worry about being hit with 4x bug damage though right away.

Umbreon @ Leftovers
Synchronize
252 HP / 100 SpD / 88 Def / 64 Spe
Careful
- Mean look
- Wish
- Baton Pass
- Yawn
This is my second receiver of Ninjask, and its vital Umbreon doesnt lose get Ko'd, or my whole team is pretty much fucked. Mean look, if I can afford to stay in another turn go yawn, and BP to whichever chainer can counter best. Pretty standard Umbreon. Mean Look doesnt work well with SR, but Im risking that for the knock out. I can also bring this in later game for wish support etc.

Tyranitar @ Life Orb
Sand Stream
4 HP / 252 Atk / 148 Def / 100 Spe
Adamant
- Aqua Tail
- Fire Punch
- Crunch
- Stone Edge
My late game threat, the core to the sweep I want. This is when it comes down to the wire, and it will recieve the BP from Umbreon off of Jask most likely. It provides excellent coverage, as well as hitting everything hard. I took out alot of the Speed EV's to the boosts from Ninjask, and the SD/Liechi boosts along with 252 Att Evs is killer. The extra defense Evs are to hopefully give me a chance to survive a CC or another incoming SE attack. Im very open to EV help here.

Jolteon @ Leftovers
Volt Absorb
252 SpA/252 Spe/4 Def
Timid
- Thunderbolt
- Hidden Power Ice
- Shadow Ball
- Baton Pass
Oh hai der Jolteon. The special sweeper of the team. The idea is to get Celebi to set up a couple of Calm Minds, and bring a deadly special surprise. Baton Pass Ill be able to BP if I havent brought in TTar yet and times winding down. Since Jolteon probably wont receive Jask's Speed boosts, Im keeping the standard 252 Speed. With all moves hitting for neutral damage at least, Jolteon is a key staple to my team.
Well thats my team. Again, any advice/criticism is appreciated.